/*  Prototype JavaScript framework, version 1.7.3
 *  (c) 2005-2010 Sam Stephenson
 *
 *  Prototype is freely distributable under the terms of an MIT-style license.
 *  For details, see the Prototype web site: http://www.prototypejs.org/
 *
 *--------------------------------------------------------------------------*/

var Prototype = {

    Version: '1.7.3',

    Browser: (function(){
        var ua = navigator.userAgent;
        var isOpera = Object.prototype.toString.call(window.opera) == '[object Opera]';
        return {
            IE:             !!window.attachEvent && !isOpera,
              IE10:           ua.indexOf('MSIE 10') > -1,
              IE10plus:       ua.indexOf('MSIE 10') > -1 || ua.indexOf('MSIE 11') > -1 || ua.indexOf('MSIE 12') > -1 || ua.indexOf('MSIE 13') > -1 || ua.indexOf('.NET4.0') > -1 ,
            Opera:          isOpera,
            WebKit:         ua.indexOf('AppleWebKit/') > -1,
            Gecko:          ua.indexOf('Gecko') > -1 && ua.indexOf('KHTML') === -1,
            MobileSafari:   /Apple.*Mobile/.test(ua)
        }
    })(),

    BrowserFeatures: {
        XPath: !!document.evaluate,

        SelectorsAPI: !!document.querySelector,

        ElementExtensions: (function() {
            var constructor = window.Element || window.HTMLElement;
            return !!(constructor && constructor.prototype);
        })(),
        SpecificElementExtensions: (function() {
            if (typeof window.HTMLDivElement !== 'undefined')
                return true;

            var div = document.createElement('div'),
                form = document.createElement('form'),
                isSupported = false;

            if (div['__proto__'] && (div['__proto__'] !== form['__proto__'])) {
                isSupported = true;
            }

            div = form = null;

            return isSupported;
        })()
    },

    ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script\\s*>',
    JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,

    emptyFunction: function() { },

    K: function(x) { return x }
};

if (Prototype.Browser.MobileSafari)
    Prototype.BrowserFeatures.SpecificElementExtensions = false;
/* Based on Alex Arnell's inheritance implementation. */

var Class = (function() {

    var IS_DONTENUM_BUGGY = (function(){
        for (var p in { toString: 1 }) {
            if (p === 'toString') return false;
        }
        return true;
    })();

    function subclass() {};
    function create() {
        var parent = null, properties = $A(arguments);
        if (Object.isFunction(properties[0]))
            parent = properties.shift();

        function klass() {
            this.initialize.apply(this, arguments);
        }

        Object.extend(klass, Class.Methods);
        klass.superclass = parent;
        klass.subclasses = [];

        if (parent) {
            subclass.prototype = parent.prototype;
            klass.prototype = new subclass;
            parent.subclasses.push(klass);
        }

        for (var i = 0, length = properties.length; i < length; i++)
            klass.addMethods(properties[i]);

        if (!klass.prototype.initialize)
            klass.prototype.initialize = Prototype.emptyFunction;

        klass.prototype.constructor = klass;
        return klass;
    }

    function addMethods(source) {
        var ancestor   = this.superclass && this.superclass.prototype,
            properties = Object.keys(source);

        if (IS_DONTENUM_BUGGY) {
            if (source.toString != Object.prototype.toString)
                properties.push("toString");
            if (source.valueOf != Object.prototype.valueOf)
                properties.push("valueOf");
        }

        for (var i = 0, length = properties.length; i < length; i++) {
            var property = properties[i], value = source[property];
            if (ancestor && Object.isFunction(value) &&
                value.argumentNames()[0] == "$super") {
                var method = value;
                value = (function(m) {
                    return function() { return ancestor[m].apply(this, arguments); };
                })(property).wrap(method);

                value.valueOf = (function(method) {
                    return function() { return method.valueOf.call(method); };
                })(method);

                value.toString = (function(method) {
                    return function() { return method.toString.call(method); };
                })(method);
            }
            this.prototype[property] = value;
        }

        return this;
    }

    return {
        create: create,
        Methods: {
            addMethods: addMethods
        }
    };
})();
(function() {

    var _toString = Object.prototype.toString,
        _hasOwnProperty = Object.prototype.hasOwnProperty,
        NULL_TYPE = 'Null',
        UNDEFINED_TYPE = 'Undefined',
        BOOLEAN_TYPE = 'Boolean',
        NUMBER_TYPE = 'Number',
        STRING_TYPE = 'String',
        OBJECT_TYPE = 'Object',
        FUNCTION_CLASS = '[object Function]',
        BOOLEAN_CLASS = '[object Boolean]',
        NUMBER_CLASS = '[object Number]',
        STRING_CLASS = '[object String]',
        ARRAY_CLASS = '[object Array]',
        DATE_CLASS = '[object Date]',
        NATIVE_JSON_STRINGIFY_SUPPORT = window.JSON &&
            typeof JSON.stringify === 'function' &&
            JSON.stringify(0) === '0' &&
            typeof JSON.stringify(Prototype.K) === 'undefined';



    var DONT_ENUMS = ['toString', 'toLocaleString', 'valueOf',
        'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable', 'constructor'];

    var IS_DONTENUM_BUGGY = (function(){
        for (var p in { toString: 1 }) {
            if (p === 'toString') return false;
        }
        return true;
    })();

    function Type(o) {
        switch(o) {
            case null: return NULL_TYPE;
            case (void 0): return UNDEFINED_TYPE;
        }
        var type = typeof o;
        switch(type) {
            case 'boolean': return BOOLEAN_TYPE;
            case 'number':  return NUMBER_TYPE;
            case 'string':  return STRING_TYPE;
        }
        return OBJECT_TYPE;
    }

    function extend(destination, source) {
        for (var property in source)
            destination[property] = source[property];
        return destination;
    }

    function inspect(object) {
        try {
            if (isUndefined(object)) return 'undefined';
            if (object === null) return 'null';
            return object.inspect ? object.inspect() : String(object);
        } catch (e) {
            if (e instanceof RangeError) return '...';
            throw e;
        }
    }

    function toJSON(value) {
        return Str('', { '': value }, []);
    }

    function Str(key, holder, stack) {
        var value = holder[key];
        if (Type(value) === OBJECT_TYPE && typeof value.toJSON === 'function') {
            value = value.toJSON(key);
        }

        var _class = _toString.call(value);

        switch (_class) {
            case NUMBER_CLASS:
            case BOOLEAN_CLASS:
            case STRING_CLASS:
                value = value.valueOf();
        }

        switch (value) {
            case null: return 'null';
            case true: return 'true';
            case false: return 'false';
        }

        var type = typeof value;
        switch (type) {
            case 'string':
                return value.inspect(true);
            case 'number':
                return isFinite(value) ? String(value) : 'null';
            case 'object':

                for (var i = 0, length = stack.length; i < length; i++) {
                    if (stack[i] === value) {
                        throw new TypeError("Cyclic reference to '" + value + "' in object");
                    }
                }
                stack.push(value);

                var partial = [];
                if (_class === ARRAY_CLASS) {
                    for (var i = 0, length = value.length; i < length; i++) {
                        var str = Str(i, value, stack);
                        partial.push(typeof str === 'undefined' ? 'null' : str);
                    }
                    partial = '[' + partial.join(',') + ']';
                } else {
                    var keys = Object.keys(value);
                    for (var i = 0, length = keys.length; i < length; i++) {
                        var key = keys[i], str = Str(key, value, stack);
                        if (typeof str !== "undefined") {
                            partial.push(key.inspect(true)+ ':' + str);
                        }
                    }
                    partial = '{' + partial.join(',') + '}';
                }
                stack.pop();
                return partial;
        }
    }

    function stringify(object) {
        return JSON.stringify(object);
    }

    function toQueryString(object) {
        return $H(object).toQueryString();
    }

    function toHTML(object) {
        return object && object.toHTML ? object.toHTML() : String.interpret(object);
    }

    function keys(object) {
        if (Type(object) !== OBJECT_TYPE) { throw new TypeError(); }
        var results = [];
        for (var property in object) {
            if (_hasOwnProperty.call(object, property))
                results.push(property);
        }

        if (IS_DONTENUM_BUGGY) {
            for (var i = 0; property = DONT_ENUMS[i]; i++) {
                if (_hasOwnProperty.call(object, property))
                    results.push(property);
            }
        }

        return results;
    }

    function values(object) {
        var results = [];
        for (var property in object)
            results.push(object[property]);
        return results;
    }

    function clone(object) {
        return extend({ }, object);
    }

    function isElement(object) {
        return !!(object && object.nodeType == 1);
    }

    function isArray(object) {
        return _toString.call(object) === ARRAY_CLASS;
    }

    var hasNativeIsArray = (typeof Array.isArray == 'function')
        && Array.isArray([]) && !Array.isArray({});

    if (hasNativeIsArray) {
        isArray = Array.isArray;
    }

    function isHash(object) {
        return object instanceof Hash;
    }

    function isFunction(object) {
        return _toString.call(object) === FUNCTION_CLASS;
    }

    function isString(object) {
        return _toString.call(object) === STRING_CLASS;
    }

    function isNumber(object) {
        return _toString.call(object) === NUMBER_CLASS;
    }

    function isDate(object) {
        return _toString.call(object) === DATE_CLASS;
    }

    function isUndefined(object) {
        return typeof object === "undefined";
    }

    extend(Object, {
        extend:        extend,
        inspect:       inspect,
        toJSON:        NATIVE_JSON_STRINGIFY_SUPPORT ? stringify : toJSON,
        toQueryString: toQueryString,
        toHTML:        toHTML,
        keys:          Object.keys || keys,
        values:        values,
        clone:         clone,
        isElement:     isElement,
        isArray:       isArray,
        isHash:        isHash,
        isFunction:    isFunction,
        isString:      isString,
        isNumber:      isNumber,
        isDate:        isDate,
        isUndefined:   isUndefined
    });
})();
Object.extend(Function.prototype, (function() {
    var slice = Array.prototype.slice;

    function update(array, args) {
        var arrayLength = array.length, length = args.length;
        while (length--) array[arrayLength + length] = args[length];
        return array;
    }

    function merge(array, args) {
        array = slice.call(array, 0);
        return update(array, args);
    }

    function argumentNames() {
        var names = this.toString().match(/^[\s\(]*function[^(]*\(([^)]*)\)/)[1]
            .replace(/\/\/.*?[\r\n]|\/\*(?:.|[\r\n])*?\*\//g, '')
            .replace(/\s+/g, '').split(',');
        return names.length == 1 && !names[0] ? [] : names;
    }


    function bind(context) {
        if (arguments.length < 2 && Object.isUndefined(arguments[0]))
            return this;

        if (!Object.isFunction(this))
            throw new TypeError("The object is not callable.");

        var nop = function() {};
        var __method = this, args = slice.call(arguments, 1);

        var bound = function() {
            var a = merge(args, arguments);
            var c = this instanceof bound ? this : context;
            return __method.apply(c, a);
        };

        nop.prototype   = this.prototype;
        bound.prototype = new nop();

        return bound;
    }

    function bindAsEventListener(context) {
        var __method = this, args = slice.call(arguments, 1);
        return function(event) {
            var a = update([event || window.event], args);
            return __method.apply(context, a);
        }
    }

    function curry() {
        if (!arguments.length) return this;
        var __method = this, args = slice.call(arguments, 0);
        return function() {
            var a = merge(args, arguments);
            return __method.apply(this, a);
        }
    }

    function delay(timeout) {
        var __method = this, args = slice.call(arguments, 1);
        timeout = timeout * 1000;
        return window.setTimeout(function() {
            return __method.apply(__method, args);
        }, timeout);
    }

    function defer() {
        var args = update([0.01], arguments);
        return this.delay.apply(this, args);
    }

    function wrap(wrapper) {
        var __method = this;
        return function() {
            var a = update([__method.bind(this)], arguments);
            return wrapper.apply(this, a);
        }
    }

    function methodize() {
        if (this._methodized) return this._methodized;
        var __method = this;
        return this._methodized = function() {
            var a = update([this], arguments);
            return __method.apply(null, a);
        };
    }

    var extensions = {
        argumentNames:       argumentNames,
        bindAsEventListener: bindAsEventListener,
        curry:               curry,
        delay:               delay,
        defer:               defer,
        wrap:                wrap,
        methodize:           methodize
    };

    if (!Function.prototype.bind)
        extensions.bind = bind;

    return extensions;
})());



(function(proto) {


    function toISOString() {
        return this.getUTCFullYear() + '-' +
            (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
            this.getUTCDate().toPaddedString(2) + 'T' +
            this.getUTCHours().toPaddedString(2) + ':' +
            this.getUTCMinutes().toPaddedString(2) + ':' +
            this.getUTCSeconds().toPaddedString(2) + 'Z';
    }


    function toJSON() {
        return this.toISOString();
    }

    if (!proto.toISOString) proto.toISOString = toISOString;
    if (!proto.toJSON) proto.toJSON = toJSON;

})(Date.prototype);


RegExp.prototype.match = RegExp.prototype.test;

RegExp.escape = function(str) {
    return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
};
var PeriodicalExecuter = Class.create({
    initialize: function(callback, frequency) {
        this.callback = callback;
        this.frequency = frequency;
        this.currentlyExecuting = false;

        this.registerCallback();
    },

    registerCallback: function() {
        this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
    },

    execute: function() {
        this.callback(this);
    },

    stop: function() {
        if (!this.timer) return;
        clearInterval(this.timer);
        this.timer = null;
    },

    onTimerEvent: function() {
        if (!this.currentlyExecuting) {
            try {
                this.currentlyExecuting = true;
                this.execute();
                this.currentlyExecuting = false;
            } catch(e) {
                this.currentlyExecuting = false;
                throw e;
            }
        }
    }
});
Object.extend(String, {
    interpret: function(value) {
        return value == null ? '' : String(value);
    },
    specialChar: {
        '\b': '\\b',
        '\t': '\\t',
        '\n': '\\n',
        '\f': '\\f',
        '\r': '\\r',
        '\\': '\\\\'
    }
});

Object.extend(String.prototype, (function() {
    var NATIVE_JSON_PARSE_SUPPORT = window.JSON &&
        typeof JSON.parse === 'function' &&
        JSON.parse('{"test": true}').test;

    function prepareReplacement(replacement) {
        if (Object.isFunction(replacement)) return replacement;
        var template = new Template(replacement);
        return function(match) { return template.evaluate(match) };
    }

    function isNonEmptyRegExp(regexp) {
        return regexp.source && regexp.source !== '(?:)';
    }


    function gsub(pattern, replacement) {
        var result = '', source = this, match;
        replacement = prepareReplacement(replacement);

        if (Object.isString(pattern))
            pattern = RegExp.escape(pattern);

        if (!(pattern.length || isNonEmptyRegExp(pattern))) {
            replacement = replacement('');
            return replacement + source.split('').join(replacement) + replacement;
        }

        while (source.length > 0) {
            match = source.match(pattern);
            if (match && match[0].length > 0) {
                result += source.slice(0, match.index);
                result += String.interpret(replacement(match));
                source  = source.slice(match.index + match[0].length);
            } else {
                result += source, source = '';
            }
        }
        return result;
    }

    function sub(pattern, replacement, count) {
        replacement = prepareReplacement(replacement);
        count = Object.isUndefined(count) ? 1 : count;

        return this.gsub(pattern, function(match) {
            if (--count < 0) return match[0];
            return replacement(match);
        });
    }

    function scan(pattern, iterator) {
        this.gsub(pattern, iterator);
        return String(this);
    }

    function truncate(length, truncation) {
        length = length || 30;
        truncation = Object.isUndefined(truncation) ? '...' : truncation;
        return this.length > length ?
        this.slice(0, length - truncation.length) + truncation : String(this);
    }

    function strip() {
        return this.replace(/^\s+/, '').replace(/\s+$/, '');
    }

    function stripTags() {
        return this.replace(/<\w+(\s+("[^"]*"|'[^']*'|[^>])+)?(\/)?>|<\/\w+>/gi, '');
    }

    function stripScripts() {
        return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
    }

    function extractScripts() {
        var matchAll = new RegExp(Prototype.ScriptFragment, 'img'),
            matchOne = new RegExp(Prototype.ScriptFragment, 'im');
        return (this.match(matchAll) || []).map(function(scriptTag) {
            return (scriptTag.match(matchOne) || ['', ''])[1];
        });
    }

    function evalScripts() {
        return this.extractScripts().map(function(script) { return eval(script); });
    }

    function escapeHTML() {
        return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
    }

    function unescapeHTML() {
        return this.stripTags().replace(/&lt;/g,'<').replace(/&gt;/g,'>').replace(/&amp;/g,'&');
    }


    function toQueryParams(separator) {
        var match = this.strip().match(/([^?#]*)(#.*)?$/);
        if (!match) return { };

        return match[1].split(separator || '&').inject({ }, function(hash, pair) {
            if ((pair = pair.split('='))[0]) {
                var key = decodeURIComponent(pair.shift()),
                    value = pair.length > 1 ? pair.join('=') : pair[0];

                if (value != undefined) {
                    value = value.gsub('+', ' ');
                    value = decodeURIComponent(value);
                }

                if (key in hash) {
                    if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
                    hash[key].push(value);
                }
                else hash[key] = value;
            }
            return hash;
        });
    }

    function toArray() {
        return this.split('');
    }

    function succ() {
        return this.slice(0, this.length - 1) +
            String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
    }

    function times(count) {
        return count < 1 ? '' : new Array(count + 1).join(this);
    }

    function camelize() {
        return this.replace(/-+(.)?/g, function(match, chr) {
            return chr ? chr.toUpperCase() : '';
        });
    }

    function capitalize() {
        return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
    }

    function underscore() {
        return this.replace(/::/g, '/')
            .replace(/([A-Z]+)([A-Z][a-z])/g, '$1_$2')
            .replace(/([a-z\d])([A-Z])/g, '$1_$2')
            .replace(/-/g, '_')
            .toLowerCase();
    }

    function dasherize() {
        return this.replace(/_/g, '-');
    }

    function inspect(useDoubleQuotes) {
        var escapedString = this.replace(/[\x00-\x1f\\]/g, function(character) {
            if (character in String.specialChar) {
                return String.specialChar[character];
            }
            return '\\u00' + character.charCodeAt().toPaddedString(2, 16);
        });
        if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
        return "'" + escapedString.replace(/'/g, '\\\'') + "'";
    }

    function unfilterJSON(filter) {
        return this.replace(filter || Prototype.JSONFilter, '$1');
    }

    function isJSON() {
        var str = this;
        if (str.blank()) return false;
        str = str.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@');
        str = str.replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']');
        str = str.replace(/(?:^|:|,)(?:\s*\[)+/g, '');
        return (/^[\],:{}\s]*$/).test(str);
    }

    function evalJSON(sanitize) {
        var json = this.unfilterJSON(),
            cx = /[\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff\u0000]/g;
        if (cx.test(json)) {
            json = json.replace(cx, function (a) {
                return '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
            });
        }
        try {
            if (!sanitize || json.isJSON()) return eval('(' + json + ')');
        } catch (e) { }
        throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
    }

    function parseJSON() {
        var json = this.unfilterJSON();
        return JSON.parse(json);
    }

    function include(pattern) {
        return this.indexOf(pattern) > -1;
    }

    function startsWith(pattern, position) {
        position = Object.isNumber(position) ? position : 0;
        return this.lastIndexOf(pattern, position) === position;
    }

    function endsWith(pattern, position) {
        pattern = String(pattern);
        position = Object.isNumber(position) ? position : this.length;
        if (position < 0) position = 0;
        if (position > this.length) position = this.length;
        var d = position - pattern.length;
        return d >= 0 && this.indexOf(pattern, d) === d;
    }

    function empty() {
        return this == '';
    }

    function blank() {
        return /^\s*$/.test(this);
    }

    function interpolate(object, pattern) {
        return new Template(this, pattern).evaluate(object);
    }

    return {
        gsub:           gsub,
        sub:            sub,
        scan:           scan,
        truncate:       truncate,
        strip:          String.prototype.trim || strip,
        stripTags:      stripTags,
        stripScripts:   stripScripts,
        extractScripts: extractScripts,
        evalScripts:    evalScripts,
        escapeHTML:     escapeHTML,
        unescapeHTML:   unescapeHTML,
        toQueryParams:  toQueryParams,
        parseQuery:     toQueryParams,
        toArray:        toArray,
        succ:           succ,
        times:          times,
        camelize:       camelize,
        capitalize:     capitalize,
        underscore:     underscore,
        dasherize:      dasherize,
        inspect:        inspect,
        unfilterJSON:   unfilterJSON,
        isJSON:         isJSON,
        evalJSON:       NATIVE_JSON_PARSE_SUPPORT ? parseJSON : evalJSON,
        include:        include,
        startsWith:     String.prototype.startsWith || startsWith,
        endsWith:       String.prototype.endsWith || endsWith,
        empty:          empty,
        blank:          blank,
        interpolate:    interpolate
    };
})());

var Template = Class.create({
    initialize: function(template, pattern) {
        this.template = template.toString();
        this.pattern = pattern || Template.Pattern;
    },

    evaluate: function(object) {
        if (object && Object.isFunction(object.toTemplateReplacements))
            object = object.toTemplateReplacements();

        return this.template.gsub(this.pattern, function(match) {
            if (object == null) return (match[1] + '');

            var before = match[1] || '';
            if (before == '\\') return match[2];

            var ctx = object, expr = match[3],
                pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;

            match = pattern.exec(expr);
            if (match == null) return before;

            while (match != null) {
                var comp = match[1].startsWith('[') ? match[2].replace(/\\\\]/g, ']') : match[1];
                ctx = ctx[comp];
                if (null == ctx || '' == match[3]) break;
                expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
                match = pattern.exec(expr);
            }

            return before + String.interpret(ctx);
        });
    }
});
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;

var $break = { };

var Enumerable = (function() {
    function each(iterator, context) {
        try {
            this._each(iterator, context);
        } catch (e) {
            if (e != $break) throw e;
        }
        return this;
    }

    function eachSlice(number, iterator, context) {
        var index = -number, slices = [], array = this.toArray();
        if (number < 1) return array;
        while ((index += number) < array.length)
            slices.push(array.slice(index, index+number));
        return slices.collect(iterator, context);
    }

    function all(iterator, context) {
        iterator = iterator || Prototype.K;
        var result = true;
        this.each(function(value, index) {
            result = result && !!iterator.call(context, value, index, this);
            if (!result) throw $break;
        }, this);
        return result;
    }

    function any(iterator, context) {
        iterator = iterator || Prototype.K;
        var result = false;
        this.each(function(value, index) {
            if (result = !!iterator.call(context, value, index, this))
                throw $break;
        }, this);
        return result;
    }

    function collect(iterator, context) {
        iterator = iterator || Prototype.K;
        var results = [];
        this.each(function(value, index) {
            results.push(iterator.call(context, value, index, this));
        }, this);
        return results;
    }

    function detect(iterator, context) {
        var result;
        this.each(function(value, index) {
            if (iterator.call(context, value, index, this)) {
                result = value;
                throw $break;
            }
        }, this);
        return result;
    }

    function findAll(iterator, context) {
        var results = [];
        this.each(function(value, index) {
            if (iterator.call(context, value, index, this))
                results.push(value);
        }, this);
        return results;
    }

    function grep(filter, iterator, context) {
        iterator = iterator || Prototype.K;
        var results = [];

        if (Object.isString(filter))
            filter = new RegExp(RegExp.escape(filter));

        this.each(function(value, index) {
            if (filter.match(value))
                results.push(iterator.call(context, value, index, this));
        }, this);
        return results;
    }

    function include(object) {
        if (Object.isFunction(this.indexOf) && this.indexOf(object) != -1)
            return true;

        var found = false;
        this.each(function(value) {
            if (value == object) {
                found = true;
                throw $break;
            }
        });
        return found;
    }

    function inGroupsOf(number, fillWith) {
        fillWith = Object.isUndefined(fillWith) ? null : fillWith;
        return this.eachSlice(number, function(slice) {
            while(slice.length < number) slice.push(fillWith);
            return slice;
        });
    }

    function inject(memo, iterator, context) {
        this.each(function(value, index) {
            memo = iterator.call(context, memo, value, index, this);
        }, this);
        return memo;
    }

    function invoke(method) {
        var args = $A(arguments).slice(1);
        return this.map(function(value) {
            return value[method].apply(value, args);
        });
    }

    function max(iterator, context) {
        iterator = iterator || Prototype.K;
        var result;
        this.each(function(value, index) {
            value = iterator.call(context, value, index, this);
            if (result == null || value >= result)
                result = value;
        }, this);
        return result;
    }

    function min(iterator, context) {
        iterator = iterator || Prototype.K;
        var result;
        this.each(function(value, index) {
            value = iterator.call(context, value, index, this);
            if (result == null || value < result)
                result = value;
        }, this);
        return result;
    }

    function partition(iterator, context) {
        iterator = iterator || Prototype.K;
        var trues = [], falses = [];
        this.each(function(value, index) {
            (iterator.call(context, value, index, this) ?
                trues : falses).push(value);
        }, this);
        return [trues, falses];
    }

    function pluck(property) {
        var results = [];
        this.each(function(value) {
            results.push(value[property]);
        });
        return results;
    }

    function reject(iterator, context) {
        var results = [];
        this.each(function(value, index) {
            if (!iterator.call(context, value, index, this))
                results.push(value);
        }, this);
        return results;
    }

    function sortBy(iterator, context) {
        return this.map(function(value, index) {
            return {
                value: value,
                criteria: iterator.call(context, value, index, this)
            };
        }, this).sort(function(left, right) {
            var a = left.criteria, b = right.criteria;
            return a < b ? -1 : a > b ? 1 : 0;
        }).pluck('value');
    }

    function toArray() {
        return this.map();
    }

    function zip() {
        var iterator = Prototype.K, args = $A(arguments);
        if (Object.isFunction(args.last()))
            iterator = args.pop();

        var collections = [this].concat(args).map($A);
        return this.map(function(value, index) {
            return iterator(collections.pluck(index));
        });
    }

    function size() {
        return this.toArray().length;
    }

    function inspect() {
        return '#<Enumerable:' + this.toArray().inspect() + '>';
    }









    return {
        each:       each,
        eachSlice:  eachSlice,
        all:        all,
        every:      all,
        any:        any,
        some:       any,
        collect:    collect,
        map:        collect,
        detect:     detect,
        findAll:    findAll,
        select:     findAll,
        filter:     findAll,
        grep:       grep,
        include:    include,
        member:     include,
        inGroupsOf: inGroupsOf,
        inject:     inject,
        invoke:     invoke,
        max:        max,
        min:        min,
        partition:  partition,
        pluck:      pluck,
        reject:     reject,
        sortBy:     sortBy,
        toArray:    toArray,
        entries:    toArray,
        zip:        zip,
        size:       size,
        inspect:    inspect,
        find:       detect
    };
})();

function $A(iterable) {
    if (!iterable) return [];
    if ('toArray' in Object(iterable)) return iterable.toArray();
    var length = iterable.length || 0, results = new Array(length);
    while (length--) results[length] = iterable[length];
    return results;
}


function $w(string) {
    if (!Object.isString(string)) return [];
    string = string.strip();
    return string ? string.split(/\s+/) : [];
}

Array.from = $A;


(function() {
    var arrayProto = Array.prototype,
        slice = arrayProto.slice,
        _each = arrayProto.forEach; // use native browser JS 1.6 implementation if available

    function each(iterator, context) {
        for (var i = 0, length = this.length >>> 0; i < length; i++) {
            if (i in this) iterator.call(context, this[i], i, this);
        }
    }
    if (!_each) _each = each;

    function clear() {
        this.length = 0;
        return this;
    }

    function first() {
        return this[0];
    }

    function last() {
        return this[this.length - 1];
    }

    function compact() {
        return this.select(function(value) {
            return value != null;
        });
    }

    function flatten() {
        return this.inject([], function(array, value) {
            if (Object.isArray(value))
                return array.concat(value.flatten());
            array.push(value);
            return array;
        });
    }

    function without() {
        var values = slice.call(arguments, 0);
        return this.select(function(value) {
            return !values.include(value);
        });
    }

    function reverse(inline) {
        return (inline === false ? this.toArray() : this)._reverse();
    }

    function uniq(sorted) {
        return this.inject([], function(array, value, index) {
            if (0 == index || (sorted ? array.last() != value : !array.include(value)))
                array.push(value);
            return array;
        });
    }

    function intersect(array) {
        return this.uniq().findAll(function(item) {
            return array.indexOf(item) !== -1;
        });
    }


    function clone() {
        return slice.call(this, 0);
    }

    function size() {
        return this.length;
    }

    function inspect() {
        return '[' + this.map(Object.inspect).join(', ') + ']';
    }

    function indexOf(item, i) {
        if (this == null) throw new TypeError();

        var array = Object(this), length = array.length >>> 0;
        if (length === 0) return -1;

        i = Number(i);
        if (isNaN(i)) {
            i = 0;
        } else if (i !== 0 && isFinite(i)) {
            i = (i > 0 ? 1 : -1) * Math.floor(Math.abs(i));
        }

        if (i > length) return -1;

        var k = i >= 0 ? i : Math.max(length - Math.abs(i), 0);
        for (; k < length; k++)
            if (k in array && array[k] === item) return k;
        return -1;
    }


    function lastIndexOf(item, i) {
        if (this == null) throw new TypeError();

        var array = Object(this), length = array.length >>> 0;
        if (length === 0) return -1;

        if (!Object.isUndefined(i)) {
            i = Number(i);
            if (isNaN(i)) {
                i = 0;
            } else if (i !== 0 && isFinite(i)) {
                i = (i > 0 ? 1 : -1) * Math.floor(Math.abs(i));
            }
        } else {
            i = length;
        }

        var k = i >= 0 ? Math.min(i, length - 1) :
        length - Math.abs(i);

        for (; k >= 0; k--)
            if (k in array && array[k] === item) return k;
        return -1;
    }

    function concat(_) {
        var array = [], items = slice.call(arguments, 0), item, n = 0;
        items.unshift(this);
        for (var i = 0, length = items.length; i < length; i++) {
            item = items[i];
            if (Object.isArray(item) && !('callee' in item)) {
                for (var j = 0, arrayLength = item.length; j < arrayLength; j++) {
                    if (j in item) array[n] = item[j];
                    n++;
                }
            } else {
                array[n++] = item;
            }
        }
        array.length = n;
        return array;
    }


    function wrapNative(method) {
        return function() {
            if (arguments.length === 0) {
                return method.call(this, Prototype.K);
            } else if (arguments[0] === undefined) {
                var args = slice.call(arguments, 1);
                args.unshift(Prototype.K);
                return method.apply(this, args);
            } else {
                return method.apply(this, arguments);
            }
        };
    }


    function map(iterator) {
        if (this == null) throw new TypeError();
        iterator = iterator || Prototype.K;

        var object = Object(this);
        var results = [], context = arguments[1], n = 0;

        for (var i = 0, length = object.length >>> 0; i < length; i++) {
            if (i in object) {
                results[n] = iterator.call(context, object[i], i, object);
            }
            n++;
        }
        results.length = n;
        return results;
    }

    if (arrayProto.map) {
        map = wrapNative(Array.prototype.map);
    }

    function filter(iterator) {
        if (this == null || !Object.isFunction(iterator))
            throw new TypeError();

        var object = Object(this);
        var results = [], context = arguments[1], value;

        for (var i = 0, length = object.length >>> 0; i < length; i++) {
            if (i in object) {
                value = object[i];
                if (iterator.call(context, value, i, object)) {
                    results.push(value);
                }
            }
        }
        return results;
    }

    if (arrayProto.filter) {
        filter = Array.prototype.filter;
    }

    function some(iterator) {
        if (this == null) throw new TypeError();
        iterator = iterator || Prototype.K;
        var context = arguments[1];

        var object = Object(this);
        for (var i = 0, length = object.length >>> 0; i < length; i++) {
            if (i in object && iterator.call(context, object[i], i, object)) {
                return true;
            }
        }

        return false;
    }

    if (arrayProto.some) {
        some = wrapNative(Array.prototype.some);
    }

    function every(iterator) {
        if (this == null) throw new TypeError();
        iterator = iterator || Prototype.K;
        var context = arguments[1];

        var object = Object(this);
        for (var i = 0, length = object.length >>> 0; i < length; i++) {
            if (i in object && !iterator.call(context, object[i], i, object)) {
                return false;
            }
        }

        return true;
    }

    if (arrayProto.every) {
        every = wrapNative(Array.prototype.every);
    }


    Object.extend(arrayProto, Enumerable);

    if (arrayProto.entries === Enumerable.entries) {
        delete arrayProto.entries;
    }

    if (!arrayProto._reverse)
        arrayProto._reverse = arrayProto.reverse;

    Object.extend(arrayProto, {
        _each:     _each,

        map:       map,
        collect:   map,
        select:    filter,
        filter:    filter,
        findAll:   filter,
        some:      some,
        any:       some,
        every:     every,
        all:       every,

        clear:     clear,
        first:     first,
        last:      last,
        compact:   compact,
        flatten:   flatten,
        without:   without,
        reverse:   reverse,
        uniq:      uniq,
        intersect: intersect,
        clone:     clone,
        toArray:   clone,
        size:      size,
        inspect:   inspect
    });

    var CONCAT_ARGUMENTS_BUGGY = (function() {
        return [].concat(arguments)[0][0] !== 1;
    })(1,2);

    if (CONCAT_ARGUMENTS_BUGGY) arrayProto.concat = concat;

    if (!arrayProto.indexOf) arrayProto.indexOf = indexOf;
    if (!arrayProto.lastIndexOf) arrayProto.lastIndexOf = lastIndexOf;
})();
function $H(object) {
    return new Hash(object);
};

var Hash = Class.create(Enumerable, (function() {
    function initialize(object) {
        this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
    }


    function _each(iterator, context) {
        var i = 0;
        for (var key in this._object) {
            var value = this._object[key], pair = [key, value];
            pair.key = key;
            pair.value = value;
            iterator.call(context, pair, i);
            i++;
        }
    }

    function set(key, value) {
        return this._object[key] = value;
    }

    function get(key) {
        if (this._object[key] !== Object.prototype[key])
            return this._object[key];
    }

    function unset(key) {
        var value = this._object[key];
        delete this._object[key];
        return value;
    }

    function toObject() {
        return Object.clone(this._object);
    }



    function keys() {
        return this.pluck('key');
    }

    function values() {
        return this.pluck('value');
    }

    function index(value) {
        var match = this.detect(function(pair) {
            return pair.value === value;
        });
        return match && match.key;
    }

    function merge(object) {
        return this.clone().update(object);
    }

    function update(object) {
        return new Hash(object).inject(this, function(result, pair) {
            result.set(pair.key, pair.value);
            return result;
        });
    }

    function toQueryPair(key, value) {
        if (Object.isUndefined(value)) return key;

        value = String.interpret(value);

        value = value.gsub(/(\r)?\n/, '\r\n');
        value = encodeURIComponent(value);
        value = value.gsub(/%20/, '+');
        return key + '=' + value;
    }

    function toQueryString() {
        return this.inject([], function(results, pair) {
            var key = encodeURIComponent(pair.key), values = pair.value;

            if (values && typeof values == 'object') {
                if (Object.isArray(values)) {
                    var queryValues = [];
                    for (var i = 0, len = values.length, value; i < len; i++) {
                        value = values[i];
                        queryValues.push(toQueryPair(key, value));
                    }
                    return results.concat(queryValues);
                }
            } else results.push(toQueryPair(key, values));
            return results;
        }).join('&');
    }

    function inspect() {
        return '#<Hash:{' + this.map(function(pair) {
                return pair.map(Object.inspect).join(': ');
            }).join(', ') + '}>';
    }

    function clone() {
        return new Hash(this);
    }

    return {
        initialize:             initialize,
        _each:                  _each,
        set:                    set,
        get:                    get,
        unset:                  unset,
        toObject:               toObject,
        toTemplateReplacements: toObject,
        keys:                   keys,
        values:                 values,
        index:                  index,
        merge:                  merge,
        update:                 update,
        toQueryString:          toQueryString,
        inspect:                inspect,
        toJSON:                 toObject,
        clone:                  clone
    };
})());

Hash.from = $H;
Object.extend(Number.prototype, (function() {
    function toColorPart() {
        return this.toPaddedString(2, 16);
    }

    function succ() {
        return this + 1;
    }

    function times(iterator, context) {
        $R(0, this, true).each(iterator, context);
        return this;
    }

    function toPaddedString(length, radix) {
        var string = this.toString(radix || 10);
        return '0'.times(length - string.length) + string;
    }

    function abs() {
        return Math.abs(this);
    }

    function round() {
        return Math.round(this);
    }

    function ceil() {
        return Math.ceil(this);
    }

    function floor() {
        return Math.floor(this);
    }

    return {
        toColorPart:    toColorPart,
        succ:           succ,
        times:          times,
        toPaddedString: toPaddedString,
        abs:            abs,
        round:          round,
        ceil:           ceil,
        floor:          floor
    };
})());

function $R(start, end, exclusive) {
    return new ObjectRange(start, end, exclusive);
}

var ObjectRange = Class.create(Enumerable, (function() {
    function initialize(start, end, exclusive) {
        this.start = start;
        this.end = end;
        this.exclusive = exclusive;
    }

    function _each(iterator, context) {
        var value = this.start, i;
        for (i = 0; this.include(value); i++) {
            iterator.call(context, value, i);
            value = value.succ();
        }
    }

    function include(value) {
        if (value < this.start)
            return false;
        if (this.exclusive)
            return value < this.end;
        return value <= this.end;
    }

    return {
        initialize: initialize,
        _each:      _each,
        include:    include
    };
})());



var Abstract = { };


var Try = {
    these: function() {
        var returnValue;

        for (var i = 0, length = arguments.length; i < length; i++) {
            var lambda = arguments[i];
            try {
                returnValue = lambda();
                break;
            } catch (e) { }
        }

        return returnValue;
    }
};

var Ajax = {
    getTransport: function() {
        return Try.these(
                function() {return new XMLHttpRequest()},
                function() {return new ActiveXObject('Msxml2.XMLHTTP')},
                function() {return new ActiveXObject('Microsoft.XMLHTTP')}
            ) || false;
    },

    activeRequestCount: 0
};

Ajax.Responders = {
    responders: [],

    _each: function(iterator, context) {
        this.responders._each(iterator, context);
    },

    register: function(responder) {
        if (!this.include(responder))
            this.responders.push(responder);
    },

    unregister: function(responder) {
        this.responders = this.responders.without(responder);
    },

    dispatch: function(callback, request, transport, json) {
        this.each(function(responder) {
            if (Object.isFunction(responder[callback])) {
                try {
                    responder[callback].apply(responder, [request, transport, json]);
                } catch (e) { }
            }
        });
    }
};

Object.extend(Ajax.Responders, Enumerable);

Ajax.Responders.register({
    onCreate:   function() { Ajax.activeRequestCount++ },
    onComplete: function() { Ajax.activeRequestCount-- }
});
Ajax.Base = Class.create({
    initialize: function(options) {
        this.options = {
            method:       'post',
            asynchronous: true,
            contentType:  'application/x-www-form-urlencoded',
            encoding:     'UTF-8',
            parameters:   '',
            evalJSON:     true,
            evalJS:       true
        };
        Object.extend(this.options, options || { });

        this.options.method = this.options.method.toLowerCase();

        if (Object.isHash(this.options.parameters))
            this.options.parameters = this.options.parameters.toObject();
    }
});
Ajax.Request = Class.create(Ajax.Base, {
    _complete: false,

    initialize: function($super, url, options) {
        $super(options);
        this.transport = Ajax.getTransport();
        this.request(url);
    },

    request: function(url) {
        this.url = url;
        this.method = this.options.method;
        var params = Object.isString(this.options.parameters) ?
            this.options.parameters :
            Object.toQueryString(this.options.parameters);

        if (!['get', 'post'].include(this.method)) {
            params += (params ? '&' : '') + "_method=" + this.method;
            this.method = 'post';
        }

        if (params && this.method === 'get') {
            this.url += (this.url.include('?') ? '&' : '?') + params;
        }

        this.parameters = params.toQueryParams();

        try {
            var response = new Ajax.Response(this);
            if (this.options.onCreate) this.options.onCreate(response);
            Ajax.Responders.dispatch('onCreate', this, response);

            this.transport.open(this.method.toUpperCase(), this.url,
                this.options.asynchronous);

            if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);
              else if(this.options.msxmldoctype && Prototype.Browser.IE10) {
                  try {this.transport.responseType = 'msxml-document'; } catch(e){}
              }


            this.transport.onreadystatechange = this.onStateChange.bind(this);
            this.setRequestHeaders();

            this.body = this.method == 'post' ? (this.options.postBody || params) : null;
            this.transport.send(this.body);

            /* Force Firefox to handle ready state 4 for synchronous requests */
            if (!this.options.asynchronous && this.transport.overrideMimeType)
                this.onStateChange();

        }
        catch (e) {
            this.dispatchException(e);
        }
    },

    onStateChange: function() {
        var readyState = this.transport.readyState;
        if (readyState > 1 && !((readyState == 4) && this._complete))
            this.respondToReadyState(this.transport.readyState);
    },

    setRequestHeaders: function() {
        var headers = {
            'X-Requested-With': 'XMLHttpRequest',
            'X-Prototype-Version': Prototype.Version,
            'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
        };

        if (this.method == 'post') {
            headers['Content-type'] = this.options.contentType +
                (this.options.encoding ? '; charset=' + this.options.encoding : '');

            /* Force "Connection: close" for older Mozilla browsers to work
             * around a bug where XMLHttpRequest sends an incorrect
             * Content-length header. See Mozilla Bugzilla #246651.
             */
            if (this.transport.overrideMimeType &&
                (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
                headers['Connection'] = 'close';
        }

        if (typeof this.options.requestHeaders == 'object') {
            var extras = this.options.requestHeaders;

            if (Object.isFunction(extras.push))
                for (var i = 0, length = extras.length; i < length; i += 2)
                    headers[extras[i]] = extras[i+1];
            else
                $H(extras).each(function(pair) { headers[pair.key] = pair.value });
        }

        for (var name in headers)
            if (headers[name] != null)
                this.transport.setRequestHeader(name, headers[name]);
    },

    success: function() {
        var status = this.getStatus();
        return !status || (status >= 200 && status < 300) || status == 304;
    },

    getStatus: function() {
        try {
            if (this.transport.status === 1223) return 204;
            return this.transport.status || 0;
        } catch (e) { return 0 }
    },

    respondToReadyState: function(readyState) {
        var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);

        if (state == 'Complete') {
            try {
                this._complete = true;
                (this.options['on' + response.status]
                || this.options['on' + (this.success() ? 'Success' : 'Failure')]
                || Prototype.emptyFunction)(response, response.headerJSON);
            } catch (e) {
                this.dispatchException(e);
            }

            var contentType = response.getHeader('Content-type');
            if (this.options.evalJS == 'force'
                || (this.options.evalJS && this.isSameOrigin() && contentType
                && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
                this.evalResponse();
        }

        try {
            (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
            Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
        } catch (e) {
            this.dispatchException(e);
        }

        if (state == 'Complete') {
            this.transport.onreadystatechange = Prototype.emptyFunction;
        }
    },

    isSameOrigin: function() {
        var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
        return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
                protocol: location.protocol,
                domain: document.domain,
                port: location.port ? ':' + location.port : ''
            }));
    },

    getHeader: function(name) {
        try {
            return this.transport.getResponseHeader(name) || null;
        } catch (e) { return null; }
    },

    evalResponse: function() {
        try {
            return eval((this.transport.responseText || '').unfilterJSON());
        } catch (e) {
            this.dispatchException(e);
        }
    },

    dispatchException: function(exception) {
        (this.options.onException || Prototype.emptyFunction)(this, exception);
        Ajax.Responders.dispatch('onException', this, exception);
    }
});

Ajax.Request.Events =
    ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];








Ajax.Response = Class.create({
    initialize: function(request){
        this.request = request;
        var transport  = this.transport  = request.transport,
            readyState = this.readyState = transport.readyState;

        if ((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
            this.status       = this.getStatus();
            this.statusText   = this.getStatusText();
            this.responseText = String.interpret(transport.responseText);
            this.headerJSON   = this._getHeaderJSON();
        }

        if (readyState == 4) {
            var xml = transport.responseXML;
            this.responseXML  = Object.isUndefined(xml) ? null : xml;
            this.responseJSON = this._getResponseJSON();
        }
    },

    status:      0,

    statusText: '',

    getStatus: Ajax.Request.prototype.getStatus,

    getStatusText: function() {
        try {
            return this.transport.statusText || '';
        } catch (e) { return '' }
    },

    getHeader: Ajax.Request.prototype.getHeader,

    getAllHeaders: function() {
        try {
            return this.getAllResponseHeaders();
        } catch (e) { return null }
    },

    getResponseHeader: function(name) {
        return this.transport.getResponseHeader(name);
    },

    getAllResponseHeaders: function() {
        return this.transport.getAllResponseHeaders();
    },

    _getHeaderJSON: function() {
        var json = this.getHeader('X-JSON');
        if (!json) return null;

        try {
            json = decodeURIComponent(escape(json));
        } catch(e) {
        }

        try {
            return json.evalJSON(this.request.options.sanitizeJSON ||
                !this.request.isSameOrigin());
        } catch (e) {
            this.request.dispatchException(e);
        }
    },

    _getResponseJSON: function() {
        var options = this.request.options;
        if (!options.evalJSON || (options.evalJSON != 'force' &&
            !(this.getHeader('Content-type') || '').include('application/json')) ||
            this.responseText.blank())
            return null;
        try {
            return this.responseText.evalJSON(options.sanitizeJSON ||
                !this.request.isSameOrigin());
        } catch (e) {
            this.request.dispatchException(e);
        }
    }
});

Ajax.Updater = Class.create(Ajax.Request, {
    initialize: function($super, container, url, options) {
        this.container = {
            success: (container.success || container),
            failure: (container.failure || (container.success ? null : container))
        };

        options = Object.clone(options);
        var onComplete = options.onComplete;
        options.onComplete = (function(response, json) {
            this.updateContent(response.responseText);
            if (Object.isFunction(onComplete)) onComplete(response, json);
        }).bind(this);

        $super(url, options);
    },

    updateContent: function(responseText) {
        var receiver = this.container[this.success() ? 'success' : 'failure'],
            options = this.options;

        if (!options.evalScripts) responseText = responseText.stripScripts();

        if (receiver = $(receiver)) {
            if (options.insertion) {
                if (Object.isString(options.insertion)) {
                    var insertion = { }; insertion[options.insertion] = responseText;
                    receiver.insert(insertion);
                }
                else options.insertion(receiver, responseText);
            }
            else receiver.update(responseText);
        }
    }
});

Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
    initialize: function($super, container, url, options) {
        $super(options);
        this.onComplete = this.options.onComplete;

        this.frequency = (this.options.frequency || 2);
        this.decay = (this.options.decay || 1);

        this.updater = { };
        this.container = container;
        this.url = url;

        this.start();
    },

    start: function() {
        this.options.onComplete = this.updateComplete.bind(this);
        this.onTimerEvent();
    },

    stop: function() {
        this.updater.options.onComplete = undefined;
        clearTimeout(this.timer);
        (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
    },

    updateComplete: function(response) {
        if (this.options.decay) {
            this.decay = (response.responseText == this.lastText ?
            this.decay * this.options.decay : 1);

            this.lastText = response.responseText;
        }
        this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
    },

    onTimerEvent: function() {
        this.updater = new Ajax.Updater(this.container, this.url, this.options);
    }
});

(function(GLOBAL) {

    var UNDEFINED;
    var SLICE = Array.prototype.slice;

    var DIV = document.createElement('div');


    function $(element) {
        if (arguments.length > 1) {
            for (var i = 0, elements = [], length = arguments.length; i < length; i++)
                elements.push($(arguments[i]));
            return elements;
        }

        if (Object.isString(element))
            element = document.getElementById(element);
        return Element.extend(element);
    }

    GLOBAL.$ = $;


    if (!GLOBAL.Node) GLOBAL.Node = {};

    if (!GLOBAL.Node.ELEMENT_NODE) {
        Object.extend(GLOBAL.Node, {
            ELEMENT_NODE:                1,
            ATTRIBUTE_NODE:              2,
            TEXT_NODE:                   3,
            CDATA_SECTION_NODE:          4,
            ENTITY_REFERENCE_NODE:       5,
            ENTITY_NODE:                 6,
            PROCESSING_INSTRUCTION_NODE: 7,
            COMMENT_NODE:                8,
            DOCUMENT_NODE:               9,
            DOCUMENT_TYPE_NODE:         10,
            DOCUMENT_FRAGMENT_NODE:     11,
            NOTATION_NODE:              12
        });
    }

    var ELEMENT_CACHE = {};

    function shouldUseCreationCache(tagName, attributes) {
        if (tagName === 'select') return false;
        if ('type' in attributes) return false;
        return true;
    }

    var HAS_EXTENDED_CREATE_ELEMENT_SYNTAX = (function(){
        try {
            var el = document.createElement('<input name="x">');
            return el.tagName.toLowerCase() === 'input' && el.name === 'x';
        }
        catch(err) {
            return false;
        }
    })();


    var oldElement = GLOBAL.Element;
    function Element(tagName, attributes) {
        attributes = attributes || {};
        tagName = tagName.toLowerCase();

        if (HAS_EXTENDED_CREATE_ELEMENT_SYNTAX && attributes.name) {
            tagName = '<' + tagName + ' name="' + attributes.name + '">';
            delete attributes.name;
            return Element.writeAttribute(document.createElement(tagName), attributes);
        }

        if (!ELEMENT_CACHE[tagName])
            ELEMENT_CACHE[tagName] = Element.extend(document.createElement(tagName));

        var node = shouldUseCreationCache(tagName, attributes) ?
            ELEMENT_CACHE[tagName].cloneNode(false) : document.createElement(tagName);

        return Element.writeAttribute(node, attributes);
    }

    GLOBAL.Element = Element;

    Object.extend(GLOBAL.Element, oldElement || {});
    if (oldElement) GLOBAL.Element.prototype = oldElement.prototype;

    Element.Methods = { ByTag: {}, Simulated: {} };

    var methods = {};

    var INSPECT_ATTRIBUTES = { id: 'id', className: 'class' };
    function inspect(element) {
        element = $(element);
        var result = '<' + element.tagName.toLowerCase();

        var attribute, value;
        for (var property in INSPECT_ATTRIBUTES) {
            attribute = INSPECT_ATTRIBUTES[property];
            value = (element[property] || '').toString();
            if (value) result += ' ' + attribute + '=' + value.inspect(true);
        }

        return result + '>';
    }

    methods.inspect = inspect;


    function visible(element) {
        return $(element).getStyle('display') !== 'none';
    }

    function toggle(element, bool) {
        element = $(element);
        if (typeof bool !== 'boolean')
            bool = !Element.visible(element);
        Element[bool ? 'show' : 'hide'](element);

        return element;
    }

    function hide(element) {
        element = $(element);
        element.style.display = 'none';
        return element;
    }

    function show(element) {
        element = $(element);
        element.style.display = '';
        return element;
    }


    Object.extend(methods, {
        visible: visible,
        toggle:  toggle,
        hide:    hide,
        show:    show
    });


    function remove(element) {
        element = $(element);
        element.parentNode.removeChild(element);
        return element;
    }

    var SELECT_ELEMENT_INNERHTML_BUGGY = (function(){
        var el = document.createElement("select"),
            isBuggy = true;
        el.innerHTML = "<option value=\"test\">test</option>";
        if (el.options && el.options[0]) {
            isBuggy = el.options[0].nodeName.toUpperCase() !== "OPTION";
        }
        el = null;
        return isBuggy;
    })();

    var TABLE_ELEMENT_INNERHTML_BUGGY = (function(){
        try {
            var el = document.createElement("table");
            if (el && el.tBodies) {
                el.innerHTML = "<tbody><tr><td>test</td></tr></tbody>";
                var isBuggy = typeof el.tBodies[0] == "undefined";
                el = null;
                return isBuggy;
            }
        } catch (e) {
            return true;
        }
    })();

    var LINK_ELEMENT_INNERHTML_BUGGY = (function() {
        try {
            var el = document.createElement('div');
            el.innerHTML = "<link />";
            var isBuggy = (el.childNodes.length === 0);
            el = null;
            return isBuggy;
        } catch(e) {
            return true;
        }
    })();

    var ANY_INNERHTML_BUGGY = SELECT_ELEMENT_INNERHTML_BUGGY ||
        TABLE_ELEMENT_INNERHTML_BUGGY || LINK_ELEMENT_INNERHTML_BUGGY;

    var SCRIPT_ELEMENT_REJECTS_TEXTNODE_APPENDING = (function () {
        var s = document.createElement("script"),
            isBuggy = false;
        try {
            s.appendChild(document.createTextNode(""));
            isBuggy = !s.firstChild ||
                s.firstChild && s.firstChild.nodeType !== 3;
        } catch (e) {
            isBuggy = true;
        }
        s = null;
        return isBuggy;
    })();

    function update(element, content) {
        element = $(element);

        var descendants = element.getElementsByTagName('*'),
            i = descendants.length;
        while (i--) purgeElement(descendants[i]);

        if (content && content.toElement)
            content = content.toElement();

        if (Object.isElement(content))
            return element.update().insert(content);


        content = Object.toHTML(content);
        var tagName = element.tagName.toUpperCase();

        if (tagName === 'SCRIPT' && SCRIPT_ELEMENT_REJECTS_TEXTNODE_APPENDING) {
            element.text = content;
            return element;
        }

        if (ANY_INNERHTML_BUGGY) {
            if (tagName in INSERTION_TRANSLATIONS.tags) {
                while (element.firstChild)
                    element.removeChild(element.firstChild);

                var nodes = getContentFromAnonymousElement(tagName, content.stripScripts());
                for (var i = 0, node; node = nodes[i]; i++)
                    element.appendChild(node);

            } else if (LINK_ELEMENT_INNERHTML_BUGGY && Object.isString(content) && content.indexOf('<link') > -1) {
                while (element.firstChild)
                    element.removeChild(element.firstChild);

                var nodes = getContentFromAnonymousElement(tagName,
                    content.stripScripts(), true);

                for (var i = 0, node; node = nodes[i]; i++)
                    element.appendChild(node);
            } else {
                element.innerHTML = content.stripScripts();
            }
        } else {
            element.innerHTML = content.stripScripts();
        }

        content.evalScripts.bind(content).defer();
        return element;
    }

    function replace(element, content) {
        element = $(element);

        if (content && content.toElement) {
            content = content.toElement();
        } else if (!Object.isElement(content)) {
            content = Object.toHTML(content);
            var range = element.ownerDocument.createRange();
            range.selectNode(element);
            content.evalScripts.bind(content).defer();
            content = range.createContextualFragment(content.stripScripts());
        }

        element.parentNode.replaceChild(content, element);
        return element;
    }

    var INSERTION_TRANSLATIONS = {
        before: function(element, node) {
            element.parentNode.insertBefore(node, element);
        },
        top: function(element, node) {
            element.insertBefore(node, element.firstChild);
        },
        bottom: function(element, node) {
            element.appendChild(node);
        },
        after: function(element, node) {
            element.parentNode.insertBefore(node, element.nextSibling);
        },

        tags: {
            TABLE:  ['<table>',                '</table>',                   1],
            TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
            TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
            TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
            SELECT: ['<select>',               '</select>',                  1]
        }
    };

    var tags = INSERTION_TRANSLATIONS.tags;

    Object.extend(tags, {
        THEAD: tags.TBODY,
        TFOOT: tags.TBODY,
        TH:    tags.TD
    });

    function replace_IE(element, content) {
        element = $(element);
        if (content && content.toElement)
            content = content.toElement();
        if (Object.isElement(content)) {
            element.parentNode.replaceChild(content, element);
            return element;
        }

        content = Object.toHTML(content);
        var parent = element.parentNode, tagName = parent.tagName.toUpperCase();

        if (tagName in INSERTION_TRANSLATIONS.tags) {
            var nextSibling = Element.next(element);
            var fragments = getContentFromAnonymousElement(
                tagName, content.stripScripts());

            parent.removeChild(element);

            var iterator;
            if (nextSibling)
                iterator = function(node) { parent.insertBefore(node, nextSibling) };
            else
                iterator = function(node) { parent.appendChild(node); };

            fragments.each(iterator);
        } else {
            element.outerHTML = content.stripScripts();
        }

        content.evalScripts.bind(content).defer();
        return element;
    }

    if ('outerHTML' in document.documentElement)
        replace = replace_IE;

    function isContent(content) {
        if (Object.isUndefined(content) || content === null) return false;

        if (Object.isString(content) || Object.isNumber(content)) return true;
        if (Object.isElement(content)) return true;
        if (content.toElement || content.toHTML) return true;

        return false;
    }

    function insertContentAt(element, content, position) {
        position   = position.toLowerCase();
        var method = INSERTION_TRANSLATIONS[position];

        if (content && content.toElement) content = content.toElement();
        if (Object.isElement(content)) {
            method(element, content);
            return element;
        }

        content = Object.toHTML(content);
        var tagName = ((position === 'before' || position === 'after') ?
            element.parentNode : element).tagName.toUpperCase();

        var childNodes = getContentFromAnonymousElement(tagName, content.stripScripts());

        if (position === 'top' || position === 'after') childNodes.reverse();

        for (var i = 0, node; node = childNodes[i]; i++)
            method(element, node);

        content.evalScripts.bind(content).defer();
    }

    function insert(element, insertions) {
        element = $(element);

        if (isContent(insertions))
            insertions = { bottom: insertions };

        for (var position in insertions)
            insertContentAt(element, insertions[position], position);

        return element;
    }

    function wrap(element, wrapper, attributes) {
        element = $(element);

        if (Object.isElement(wrapper)) {
            $(wrapper).writeAttribute(attributes || {});
        } else if (Object.isString(wrapper)) {
            wrapper = new Element(wrapper, attributes);
        } else {
            wrapper = new Element('div', wrapper);
        }

        if (element.parentNode)
            element.parentNode.replaceChild(wrapper, element);

        wrapper.appendChild(element);

        return wrapper;
    }

    function cleanWhitespace(element) {
        element = $(element);
        var node = element.firstChild;

        while (node) {
            var nextNode = node.nextSibling;
            if (node.nodeType === Node.TEXT_NODE && !/\S/.test(node.nodeValue))
                element.removeChild(node);
            node = nextNode;
        }
        return element;
    }

    function empty(element) {
        return $(element).innerHTML.blank();
    }

    function getContentFromAnonymousElement(tagName, html, force) {
        var t = INSERTION_TRANSLATIONS.tags[tagName], div = DIV;

        var workaround = !!t;
        if (!workaround && force) {
            workaround = true;
            t = ['', '', 0];
        }

        if (workaround) {
            div.innerHTML = '&#160;' + t[0] + html + t[1];
            div.removeChild(div.firstChild);
            for (var i = t[2]; i--; )
                div = div.firstChild;
        } else {
            div.innerHTML = html;
        }

        return $A(div.childNodes);
    }

    function clone(element, deep) {
        if (!(element = $(element))) return;
        var clone = element.cloneNode(deep);
        if (!HAS_UNIQUE_ID_PROPERTY) {
            clone._prototypeUID = UNDEFINED;
            if (deep) {
                var descendants = Element.select(clone, '*'),
                    i = descendants.length;
                while (i--)
                    descendants[i]._prototypeUID = UNDEFINED;
            }
        }
        return Element.extend(clone);
    }

    function purgeElement(element) {
        var uid = getUniqueElementID(element);
        if (uid) {
            Element.stopObserving(element);
            if (!HAS_UNIQUE_ID_PROPERTY)
                element._prototypeUID = UNDEFINED;
            delete Element.Storage[uid];
        }
    }

    function purgeCollection(elements) {
        var i = elements.length;
        while (i--)
            purgeElement(elements[i]);
    }

    function purgeCollection_IE(elements) {
        var i = elements.length, element, uid;
        while (i--) {
            element = elements[i];
            uid = getUniqueElementID(element);
            delete Element.Storage[uid];
            delete Event.cache[uid];
        }
    }

    if (HAS_UNIQUE_ID_PROPERTY) {
        purgeCollection = purgeCollection_IE;
    }


    function purge(element) {
        if (!(element = $(element))) return;
        purgeElement(element);

        var descendants = element.getElementsByTagName('*'),
            i = descendants.length;

        while (i--) purgeElement(descendants[i]);

        return null;
    }

    Object.extend(methods, {
        remove:  remove,
        update:  update,
        replace: replace,
        insert:  insert,
        wrap:    wrap,
        cleanWhitespace: cleanWhitespace,
        empty:   empty,
        clone:   clone,
        purge:   purge
    });



    function recursivelyCollect(element, property, maximumLength) {
        element = $(element);
        maximumLength = maximumLength || -1;
        var elements = [];

        while (element = element[property]) {
            if (element.nodeType === Node.ELEMENT_NODE)
                elements.push(Element.extend(element));

            if (elements.length === maximumLength) break;
        }

        return elements;
    }


    function ancestors(element) {
        return recursivelyCollect(element, 'parentNode');
    }

    function descendants(element) {
        return Element.select(element, '*');
    }

    function firstDescendant(element) {
        element = $(element).firstChild;
        while (element && element.nodeType !== Node.ELEMENT_NODE)
            element = element.nextSibling;

        return $(element);
    }

    function immediateDescendants(element) {
        var results = [], child = $(element).firstChild;

        while (child) {
            if (child.nodeType === Node.ELEMENT_NODE)
                results.push(Element.extend(child));

            child = child.nextSibling;
        }

        return results;
    }

    function previousSiblings(element) {
        return recursivelyCollect(element, 'previousSibling');
    }

    function nextSiblings(element) {
        return recursivelyCollect(element, 'nextSibling');
    }

    function siblings(element) {
        element = $(element);
        var previous = previousSiblings(element),
            next = nextSiblings(element);
        return previous.reverse().concat(next);
    }

    function match(element, selector) {
        element = $(element);

        if (Object.isString(selector))
            return Prototype.Selector.match(element, selector);

        return selector.match(element);
    }


    function _recursivelyFind(element, property, expression, index) {
        element = $(element), expression = expression || 0, index = index || 0;
        if (Object.isNumber(expression)) {
            index = expression, expression = null;
        }

        while (element = element[property]) {
            if (element.nodeType !== 1) continue;
            if (expression && !Prototype.Selector.match(element, expression))
                continue;
            if (--index >= 0) continue;

            return Element.extend(element);
        }
    }


    function up(element, expression, index) {
        element = $(element);

        if (arguments.length === 1) return $(element.parentNode);
        return _recursivelyFind(element, 'parentNode', expression, index);
    }

    function down(element, expression, index) {
        if (arguments.length === 1) return firstDescendant(element);
        element = $(element), expression = expression || 0, index = index || 0;

        if (Object.isNumber(expression))
            index = expression, expression = '*';

        var node = Prototype.Selector.select(expression, element)[index];
        return Element.extend(node);
    }

    function previous(element, expression, index) {
        return _recursivelyFind(element, 'previousSibling', expression, index);
    }

    function next(element, expression, index) {
        return _recursivelyFind(element, 'nextSibling', expression, index);
    }

    function select(element) {
        element = $(element);
        var expressions = SLICE.call(arguments, 1).join(', ');
        return Prototype.Selector.select(expressions, element);
    }

    function adjacent(element) {
        element = $(element);
        var expressions = SLICE.call(arguments, 1).join(', ');
        var siblings = Element.siblings(element), results = [];
        for (var i = 0, sibling; sibling = siblings[i]; i++) {
            if (Prototype.Selector.match(sibling, expressions))
                results.push(sibling);
        }

        return results;
    }

    function descendantOf_DOM(element, ancestor) {
        element = $(element), ancestor = $(ancestor);
        if (!element || !ancestor) return false;
        while (element = element.parentNode)
            if (element === ancestor) return true;
        return false;
    }

    function descendantOf_contains(element, ancestor) {
        element = $(element), ancestor = $(ancestor);
        if (!element || !ancestor) return false;
        if (!ancestor.contains) return descendantOf_DOM(element, ancestor);
        return ancestor.contains(element) && ancestor !== element;
    }

    function descendantOf_compareDocumentPosition(element, ancestor) {
        element = $(element), ancestor = $(ancestor);
        if (!element || !ancestor) return false;
        return (element.compareDocumentPosition(ancestor) & 8) === 8;
    }

    var descendantOf;
    if (DIV.compareDocumentPosition) {
        descendantOf = descendantOf_compareDocumentPosition;
    } else if (DIV.contains) {
        descendantOf = descendantOf_contains;
    } else {
        descendantOf = descendantOf_DOM;
    }


    Object.extend(methods, {
        recursivelyCollect:   recursivelyCollect,
        ancestors:            ancestors,
        descendants:          descendants,
        firstDescendant:      firstDescendant,
        immediateDescendants: immediateDescendants,
        previousSiblings:     previousSiblings,
        nextSiblings:         nextSiblings,
        siblings:             siblings,
        match:                match,
        up:                   up,
        down:                 down,
        previous:             previous,
        next:                 next,
        select:               select,
        adjacent:             adjacent,
        descendantOf:         descendantOf,

        getElementsBySelector: select,

        childElements:         immediateDescendants
    });


    var idCounter = 1;
    function identify(element) {
        element = $(element);
        var id = Element.readAttribute(element, 'id');
        if (id) return id;

        do { id = 'anonymous_element_' + idCounter++ } while ($(id));

        Element.writeAttribute(element, 'id', id);
        return id;
    }


    function readAttribute(element, name) {
        return $(element).getAttribute(name);
    }

    function readAttribute_IE(element, name) {
        element = $(element);

        var table = ATTRIBUTE_TRANSLATIONS.read;
        if (table.values[name])
            return table.values[name](element, name);

        if (table.names[name]) name = table.names[name];

        if (name.include(':')) {
            if (!element.attributes || !element.attributes[name]) return null;
            return element.attributes[name].value;
        }

        return element.getAttribute(name);
    }

    function readAttribute_Opera(element, name) {
        if (name === 'title') return element.title;
        return element.getAttribute(name);
    }

    var PROBLEMATIC_ATTRIBUTE_READING = (function() {
        DIV.setAttribute('onclick', []);
        var value = DIV.getAttribute('onclick');
        var isFunction = Object.isArray(value);
        DIV.removeAttribute('onclick');
        return isFunction;
    })();

    if (PROBLEMATIC_ATTRIBUTE_READING) {
        readAttribute = readAttribute_IE;
    } else if (Prototype.Browser.Opera) {
        readAttribute = readAttribute_Opera;
    }


    function writeAttribute(element, name, value) {
        element = $(element);
        var attributes = {}, table = ATTRIBUTE_TRANSLATIONS.write;

        if (typeof name === 'object') {
            attributes = name;
        } else {
            attributes[name] = Object.isUndefined(value) ? true : value;
        }

        for (var attr in attributes) {
            name = table.names[attr] || attr;
            value = attributes[attr];
            if (table.values[attr]) {
                value = table.values[attr](element, value);
                if (Object.isUndefined(value)) continue;
            }
            if (value === false || value === null)
                element.removeAttribute(name);
            else if (value === true)
                element.setAttribute(name, name);
            else element.setAttribute(name, value);
        }

        return element;
    }

    var PROBLEMATIC_HAS_ATTRIBUTE_WITH_CHECKBOXES = (function () {
        if (!HAS_EXTENDED_CREATE_ELEMENT_SYNTAX) {
            return false;
        }
        var checkbox = document.createElement('<input type="checkbox">');
        checkbox.checked = true;
        var node = checkbox.getAttributeNode('checked');
        return !node || !node.specified;
    })();

    function hasAttribute(element, attribute) {
        attribute = ATTRIBUTE_TRANSLATIONS.has[attribute] || attribute;
        var node = $(element).getAttributeNode(attribute);
        return !!(node && node.specified);
    }

    function hasAttribute_IE(element, attribute) {
        if (attribute === 'checked') {
            return element.checked;
        }
        return hasAttribute(element, attribute);
    }

    GLOBAL.Element.Methods.Simulated.hasAttribute =
        PROBLEMATIC_HAS_ATTRIBUTE_WITH_CHECKBOXES ?
            hasAttribute_IE : hasAttribute;

    function classNames(element) {
        return new Element.ClassNames(element);
    }

    var regExpCache = {};
    function getRegExpForClassName(className) {
        if (regExpCache[className]) return regExpCache[className];

        var re = new RegExp("(^|\\s+)" + className + "(\\s+|$)");
        regExpCache[className] = re;
        return re;
    }

    function hasClassName(element, className) {
        if (!(element = $(element))) return;

        var elementClassName = element.className;

        if (elementClassName.length === 0) return false;
        if (elementClassName === className) return true;

        return getRegExpForClassName(className).test(elementClassName);
    }

    function addClassName(element, className) {
        if (!(element = $(element))) return;

        if (!hasClassName(element, className))
            element.className += (element.className ? ' ' : '') + className;

        return element;
    }

    function removeClassName(element, className) {
        if (!(element = $(element))) return;

        element.className = element.className.replace(
            getRegExpForClassName(className), ' ').strip();

        return element;
    }

    function toggleClassName(element, className, bool) {
        if (!(element = $(element))) return;

        if (Object.isUndefined(bool))
            bool = !hasClassName(element, className);

        var method = Element[bool ? 'addClassName' : 'removeClassName'];
        return method(element, className);
    }

    var ATTRIBUTE_TRANSLATIONS = {};

    var classProp = 'className', forProp = 'for';

    DIV.setAttribute(classProp, 'x');
    if (DIV.className !== 'x') {
        DIV.setAttribute('class', 'x');
        if (DIV.className === 'x')
            classProp = 'class';
    }

    var LABEL = document.createElement('label');
    LABEL.setAttribute(forProp, 'x');
    if (LABEL.htmlFor !== 'x') {
        LABEL.setAttribute('htmlFor', 'x');
        if (LABEL.htmlFor === 'x')
            forProp = 'htmlFor';
    }
    LABEL = null;

    function _getAttr(element, attribute) {
        return element.getAttribute(attribute);
    }

    function _getAttr2(element, attribute) {
        return element.getAttribute(attribute, 2);
    }

    function _getAttrNode(element, attribute) {
        var node = element.getAttributeNode(attribute);
        return node ? node.value : '';
    }

    function _getFlag(element, attribute) {
        return $(element).hasAttribute(attribute) ? attribute : null;
    }

    DIV.onclick = Prototype.emptyFunction;
    var onclickValue = DIV.getAttribute('onclick');

    var _getEv;

    if (String(onclickValue).indexOf('{') > -1) {
        _getEv = function(element, attribute) {
            var value = element.getAttribute(attribute);
            if (!value) return null;
            value = value.toString();
            value = value.split('{')[1];
            value = value.split('}')[0];
            return value.strip();
        };
    }
    else if (onclickValue === '') {
        _getEv = function(element, attribute) {
            var value = element.getAttribute(attribute);
            if (!value) return null;
            return value.strip();
        };
    }

    ATTRIBUTE_TRANSLATIONS.read = {
        names: {
            'class':     classProp,
            'className': classProp,
            'for':       forProp,
            'htmlFor':   forProp
        },

        values: {
            style: function(element) {
                return element.style.cssText.toLowerCase();
            },
            title: function(element) {
                return element.title;
            }
        }
    };

    ATTRIBUTE_TRANSLATIONS.write = {
        names: {
            className:   'class',
            htmlFor:     'for',
            cellpadding: 'cellPadding',
            cellspacing: 'cellSpacing'
        },

        values: {
            checked: function(element, value) {
                value = !!value;
                element.checked = value;
                return value ? 'checked' : null;
            },

            style: function(element, value) {
                element.style.cssText = value ? value : '';
            }
        }
    };

    ATTRIBUTE_TRANSLATIONS.has = { names: {} };

    Object.extend(ATTRIBUTE_TRANSLATIONS.write.names,
        ATTRIBUTE_TRANSLATIONS.read.names);

    var CAMEL_CASED_ATTRIBUTE_NAMES = $w('colSpan rowSpan vAlign dateTime ' +
        'accessKey tabIndex encType maxLength readOnly longDesc frameBorder');

    for (var i = 0, attr; attr = CAMEL_CASED_ATTRIBUTE_NAMES[i]; i++) {
        ATTRIBUTE_TRANSLATIONS.write.names[attr.toLowerCase()] = attr;
        ATTRIBUTE_TRANSLATIONS.has.names[attr.toLowerCase()]   = attr;
    }

    Object.extend(ATTRIBUTE_TRANSLATIONS.read.values, {
        href:        _getAttr2,
        src:         _getAttr2,
        type:        _getAttr,
        action:      _getAttrNode,
        disabled:    _getFlag,
        checked:     _getFlag,
        readonly:    _getFlag,
        multiple:    _getFlag,
        onload:      _getEv,
        onunload:    _getEv,
        onclick:     _getEv,
        ondblclick:  _getEv,
        onmousedown: _getEv,
        onmouseup:   _getEv,
        onmouseover: _getEv,
        onmousemove: _getEv,
        onmouseout:  _getEv,
        onfocus:     _getEv,
        onblur:      _getEv,
        onkeypress:  _getEv,
        onkeydown:   _getEv,
        onkeyup:     _getEv,
        onsubmit:    _getEv,
        onreset:     _getEv,
        onselect:    _getEv,
        onchange:    _getEv
    });


    Object.extend(methods, {
        identify:        identify,
        readAttribute:   readAttribute,
        writeAttribute:  writeAttribute,
        classNames:      classNames,
        hasClassName:    hasClassName,
        addClassName:    addClassName,
        removeClassName: removeClassName,
        toggleClassName: toggleClassName
    });


    function normalizeStyleName(style) {
        if (style === 'float' || style === 'styleFloat')
            return 'cssFloat';
        return style.camelize();
    }

    function normalizeStyleName_IE(style) {
        if (style === 'float' || style === 'cssFloat')
            return 'styleFloat';
        return style.camelize();
    }

    function setStyle(element, styles) {
        element = $(element);
        var elementStyle = element.style, match;

        if (Object.isString(styles)) {
            elementStyle.cssText += ';' + styles;
            if (styles.include('opacity')) {
                var opacity = styles.match(/opacity:\s*(\d?\.?\d*)/)[1];
                Element.setOpacity(element, opacity);
            }
            return element;
        }

        for (var property in styles) {
            if (property === 'opacity') {
                Element.setOpacity(element, styles[property]);
            } else {
                var value = styles[property];
                if (property === 'float' || property === 'cssFloat') {
                    property = Object.isUndefined(elementStyle.styleFloat) ?
                        'cssFloat' : 'styleFloat';
                }
                try{
                    elementStyle[property] = value;
                }catch(e){}
            }
        }

        return element;
    }


    function getStyle(element, style) {
        element = $(element);
        style = normalizeStyleName(style);

        var value = element.style[style];
        if (!value || value === 'auto') {
            var css = document.defaultView.getComputedStyle(element, null);
            value = css ? css[style] : null;
        }

        if (style === 'opacity') return value ? parseFloat(value) : 1.0;
        return value === 'auto' ? null : value;
    }

    function getStyle_Opera(element, style) {
        switch (style) {
            case 'height': case 'width':
            if (!Element.visible(element)) return null;

            var dim = parseInt(getStyle(element, style), 10);

            if (dim !== element['offset' + style.capitalize()])
                return dim + 'px';

            return Element.measure(element, style);

            default: return getStyle(element, style);
        }
    }

    function getStyle_IE(element, style) {
        element = $(element);
        style = normalizeStyleName_IE(style);

        var value = element.style[style];
        if (!value && element.currentStyle) {
            value = element.currentStyle[style];
        }

        if (style === 'opacity') {
            if (!STANDARD_CSS_OPACITY_SUPPORTED)
                return getOpacity_IE(element);
            else return value ? parseFloat(value) : 1.0;
        }

        if (value === 'auto') {
            if ((style === 'width' || style === 'height') && Element.visible(element))
                return Element.measure(element, style) + 'px';
            return null;
        }

        return value;
    }

    function stripAlphaFromFilter_IE(filter) {
        return (filter || '').replace(/alpha\([^\)]*\)/gi, '');
    }

    function hasLayout_IE(element) {
        if (!element.currentStyle || !element.currentStyle.hasLayout)
            element.style.zoom = 1;
        return element;
    }

    var STANDARD_CSS_OPACITY_SUPPORTED = (function() {
        DIV.style.cssText = "opacity:.55";
        return /^0.55/.test(DIV.style.opacity);
    })();

    function setOpacity(element, value) {
        element = $(element);
        if (value == 1 || value === '') value = '';
        else if (value < 0.00001) value = 0;
        element.style.opacity = value;
        return element;
    }

    function setOpacity_IE(element, value) {
        if (STANDARD_CSS_OPACITY_SUPPORTED)
            return setOpacity(element, value);

        element = hasLayout_IE($(element));
        var filter = Element.getStyle(element, 'filter'),
            style = element.style;

        if (value == 1 || value === '') {
            filter = stripAlphaFromFilter_IE(filter);
            if (filter) style.filter = filter;
            else style.removeAttribute('filter');
            return element;
        }

        if (value < 0.00001) value = 0;

        style.filter = stripAlphaFromFilter_IE(filter) +
            ' alpha(opacity=' + (value * 100) + ')';

        return element;
    }


    function getOpacity(element) {
        return Element.getStyle(element, 'opacity');
    }

    function getOpacity_IE(element) {
        if (STANDARD_CSS_OPACITY_SUPPORTED)
            return getOpacity(element);

        var filter = Element.getStyle(element, 'filter');
        if (filter.length === 0) return 1.0;
        var match = (filter || '').match(/alpha\(opacity=(.*)\)/i);
        if (match && match[1]) return parseFloat(match[1]) / 100;
        return 1.0;
    }


    Object.extend(methods, {
        setStyle:   setStyle,
        getStyle:   getStyle,
        setOpacity: setOpacity,
        getOpacity: getOpacity
    });

    if ('styleFloat' in DIV.style) {
        methods.getStyle = getStyle_IE;
        methods.setOpacity = setOpacity_IE;
        methods.getOpacity = getOpacity_IE;
    }

    var UID = 0;

    GLOBAL.Element.Storage = { UID: 1 };

    function getUniqueElementID(element) {
        if (element === window) return 0;

        if (typeof element._prototypeUID === 'undefined')
            element._prototypeUID = Element.Storage.UID++;
        return element._prototypeUID;
    }

    function getUniqueElementID_IE(element) {
        if (element === window) return 0;
        if (element == document) return 1;
        return element.uniqueID;
    }

    var HAS_UNIQUE_ID_PROPERTY = ('uniqueID' in DIV);
    if (HAS_UNIQUE_ID_PROPERTY)
        getUniqueElementID = getUniqueElementID_IE;

    function getStorage(element) {
        if (!(element = $(element))) return;

        var uid = getUniqueElementID(element);

        if (!Element.Storage[uid])
            Element.Storage[uid] = $H();

        return Element.Storage[uid];
    }

    function store(element, key, value) {
        if (!(element = $(element))) return;
        var storage = getStorage(element);
        if (arguments.length === 2) {
            storage.update(key);
        } else {
            storage.set(key, value);
        }
        return element;
    }

    function retrieve(element, key, defaultValue) {
        if (!(element = $(element))) return;
        var storage = getStorage(element), value = storage.get(key);

        if (Object.isUndefined(value)) {
            storage.set(key, defaultValue);
            value = defaultValue;
        }

        return value;
    }


    Object.extend(methods, {
        getStorage: getStorage,
        store:      store,
        retrieve:   retrieve
    });


    var Methods = {}, ByTag = Element.Methods.ByTag,
        F = Prototype.BrowserFeatures;

    if (!F.ElementExtensions && ('__proto__' in DIV)) {
        GLOBAL.HTMLElement = {};
        GLOBAL.HTMLElement.prototype = DIV['__proto__'];
        F.ElementExtensions = true;
    }

    function checkElementPrototypeDeficiency(tagName) {
        if (typeof window.Element === 'undefined') return false;
        if (!HAS_EXTENDED_CREATE_ELEMENT_SYNTAX) return false;
        var proto = window.Element.prototype;
        if (proto) {
            var id = '_' + (Math.random() + '').slice(2),
                el = document.createElement(tagName);
            proto[id] = 'x';
            var isBuggy = (el[id] !== 'x');
            delete proto[id];
            el = null;
            return isBuggy;
        }

        return false;
    }

    var HTMLOBJECTELEMENT_PROTOTYPE_BUGGY =
        checkElementPrototypeDeficiency('object');

    function extendElementWith(element, methods) {
        for (var property in methods) {
            var value = methods[property];
            if (Object.isFunction(value) && !(property in element))
                element[property] = value.methodize();
        }
    }

    var EXTENDED = {};
    function elementIsExtended(element) {
        var uid = getUniqueElementID(element);
        return (uid in EXTENDED);
    }

    function extend(element) {
        if (!element || elementIsExtended(element)) return element;
        if (element.nodeType !== Node.ELEMENT_NODE || element == window)
            return element;

        var methods = Object.clone(Methods),
            tagName = element.tagName.toUpperCase();

        if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);

        extendElementWith(element, methods);
        EXTENDED[getUniqueElementID(element)] = true;
        return element;
    }

    function extend_IE8(element) {
        if (!element || elementIsExtended(element)) return element;

        var t = element.tagName;
        if (t && (/^(?:object|applet|embed)$/i.test(t))) {
            extendElementWith(element, Element.Methods);
            extendElementWith(element, Element.Methods.Simulated);
            extendElementWith(element, Element.Methods.ByTag[t.toUpperCase()]);
        }

        return element;
    }

    if (F.SpecificElementExtensions) {
        extend = HTMLOBJECTELEMENT_PROTOTYPE_BUGGY ? extend_IE8 : Prototype.K;
    }

    function addMethodsToTagName(tagName, methods) {
        tagName = tagName.toUpperCase();
        if (!ByTag[tagName]) ByTag[tagName] = {};
        Object.extend(ByTag[tagName], methods);
    }

    function mergeMethods(destination, methods, onlyIfAbsent) {
        if (Object.isUndefined(onlyIfAbsent)) onlyIfAbsent = false;
        for (var property in methods) {
            var value = methods[property];
            if (!Object.isFunction(value)) continue;
            if (!onlyIfAbsent || !(property in destination))
                destination[property] = value.methodize();
        }
    }

    function findDOMClass(tagName) {
        var klass;
        var trans = {
            "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
            "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
            "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
            "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
            "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
                "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
                "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
                "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
                "FrameSet", "IFRAME": "IFrame"
        };
        if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
        if (window[klass]) return window[klass];
        klass = 'HTML' + tagName + 'Element';
        if (window[klass]) return window[klass];
        klass = 'HTML' + tagName.capitalize() + 'Element';
        if (window[klass]) return window[klass];

        var element = document.createElement(tagName),
            proto = element['__proto__'] || element.constructor.prototype;

        element = null;
        return proto;
    }

    function addMethods(methods) {
        if (arguments.length === 0) addFormMethods();

        if (arguments.length === 2) {
            var tagName = methods;
            methods = arguments[1];
        }

        if (!tagName) {
            Object.extend(Element.Methods, methods || {});
        } else {
            if (Object.isArray(tagName)) {
                for (var i = 0, tag; tag = tagName[i]; i++)
                    addMethodsToTagName(tag, methods);
            } else {
                addMethodsToTagName(tagName, methods);
            }
        }

        var ELEMENT_PROTOTYPE = window.HTMLElement ? HTMLElement.prototype :
            Element.prototype;

        if (F.ElementExtensions) {
            mergeMethods(ELEMENT_PROTOTYPE, Element.Methods);
            mergeMethods(ELEMENT_PROTOTYPE, Element.Methods.Simulated, true);
        }

        if (F.SpecificElementExtensions) {
            for (var tag in Element.Methods.ByTag) {
                var klass = findDOMClass(tag);
                if (Object.isUndefined(klass)) continue;
                mergeMethods(klass.prototype, ByTag[tag]);
            }
        }

        Object.extend(Element, Element.Methods);
        Object.extend(Element, Element.Methods.Simulated);
        delete Element.ByTag;
        delete Element.Simulated;

        Element.extend.refresh();

        ELEMENT_CACHE = {};
    }

    Object.extend(GLOBAL.Element, {
        extend:     extend,
        addMethods: addMethods
    });

    if (extend === Prototype.K) {
        GLOBAL.Element.extend.refresh = Prototype.emptyFunction;
    } else {
        GLOBAL.Element.extend.refresh = function() {
            if (Prototype.BrowserFeatures.ElementExtensions) return;
            Object.extend(Methods, Element.Methods);
            Object.extend(Methods, Element.Methods.Simulated);

            EXTENDED = {};
        };
    }

    function addFormMethods() {
        Object.extend(Form, Form.Methods);
        Object.extend(Form.Element, Form.Element.Methods);
        Object.extend(Element.Methods.ByTag, {
            "FORM":     Object.clone(Form.Methods),
            "INPUT":    Object.clone(Form.Element.Methods),
            "SELECT":   Object.clone(Form.Element.Methods),
            "TEXTAREA": Object.clone(Form.Element.Methods),
            "BUTTON":   Object.clone(Form.Element.Methods)
        });
    }

    Element.addMethods(methods);

    function destroyCache_IE() {
        DIV = null;
        ELEMENT_CACHE = null;
    }

    if (window.attachEvent)
        window.attachEvent('onunload', destroyCache_IE);

})(this);
(function() {

    function toDecimal(pctString) {
        var match = pctString.match(/^(\d+)%?$/i);
        if (!match) return null;
        return (Number(match[1]) / 100);
    }

    function getRawStyle(element, style) {
        element = $(element);

        var value = element.style[style];
        if (!value || value === 'auto') {
            var css = document.defaultView.getComputedStyle(element, null);
            value = css ? css[style] : null;
        }

        if (style === 'opacity') return value ? parseFloat(value) : 1.0;
        return value === 'auto' ? null : value;
    }

    function getRawStyle_IE(element, style) {
        var value = element.style[style];
        if (!value && element.currentStyle) {
            value = element.currentStyle[style];
        }
        return value;
    }

    function getContentWidth(element, context) {
        var boxWidth = element.offsetWidth;

        var bl = getPixelValue(element, 'borderLeftWidth',  context) || 0;
        var br = getPixelValue(element, 'borderRightWidth', context) || 0;
        var pl = getPixelValue(element, 'paddingLeft',      context) || 0;
        var pr = getPixelValue(element, 'paddingRight',     context) || 0;

        return boxWidth - bl - br - pl - pr;
    }

    if (!Object.isUndefined(document.documentElement.currentStyle) && !Prototype.Browser.Opera) {
        getRawStyle = getRawStyle_IE;
    }


    function getPixelValue(value, property, context) {
        var element = null;
        if (Object.isElement(value)) {
            element = value;
            value = getRawStyle(element, property);
        }

        if (value === null || Object.isUndefined(value)) {
            return null;
        }

        if ((/^(?:-)?\d+(\.\d+)?(px)?$/i).test(value)) {
            return window.parseFloat(value);
        }

        var isPercentage = value.include('%'), isViewport = (context === document.viewport);

        if (/\d/.test(value) && element && element.runtimeStyle && !(isPercentage && isViewport)) {
            var style = element.style.left, rStyle = element.runtimeStyle.left;
            element.runtimeStyle.left = element.currentStyle.left;
            element.style.left = value || 0;
            value = element.style.pixelLeft;
            element.style.left = style;
            element.runtimeStyle.left = rStyle;

            return value;
        }

        if (element && isPercentage) {
            context = context || element.parentNode;
            var decimal = toDecimal(value), whole = null;

            var isHorizontal = property.include('left') || property.include('right') ||
                property.include('width');

            var isVertical   = property.include('top') || property.include('bottom') ||
                property.include('height');

            if (context === document.viewport) {
                if (isHorizontal) {
                    whole = document.viewport.getWidth();
                } else if (isVertical) {
                    whole = document.viewport.getHeight();
                }
            } else {
                if (isHorizontal) {
                    whole = $(context).measure('width');
                } else if (isVertical) {
                    whole = $(context).measure('height');
                }
            }

            return (whole === null) ? 0 : whole * decimal;
        }

        return 0;
    }

    function toCSSPixels(number) {
        if (Object.isString(number) && number.endsWith('px'))
            return number;
        return number + 'px';
    }

    function isDisplayed(element) {
        while (element && element.parentNode) {
            var display = element.getStyle('display');
            if (display === 'none') {
                return false;
            }
            element = $(element.parentNode);
        }
        return true;
    }

    var hasLayout = Prototype.K;
    if ('currentStyle' in document.documentElement) {
        hasLayout = function(element) {
            if (!element.currentStyle.hasLayout) {
                element.style.zoom = 1;
            }
            return element;
        };
    }

    function cssNameFor(key) {
        if (key.include('border')) key = key + '-width';
        return key.camelize();
    }

    Element.Layout = Class.create(Hash, {
        initialize: function($super, element, preCompute) {
            $super();
            this.element = $(element);

            Element.Layout.PROPERTIES.each( function(property) {
                this._set(property, null);
            }, this);

            if (preCompute) {
                this._preComputing = true;
                this._begin();
                Element.Layout.PROPERTIES.each( this._compute, this );
                this._end();
                this._preComputing = false;
            }
        },

        _set: function(property, value) {
            return Hash.prototype.set.call(this, property, value);
        },

        set: function(property, value) {
            throw "Properties of Element.Layout are read-only.";
        },

        get: function($super, property) {
            var value = $super(property);
            return value === null ? this._compute(property) : value;
        },

        _begin: function() {
            if (this._isPrepared()) return;

            var element = this.element;
            if (isDisplayed(element)) {
                this._setPrepared(true);
                return;
            }


            var originalStyles = {
                position:   element.style.position   || '',
                width:      element.style.width      || '',
                visibility: element.style.visibility || '',
                display:    element.style.display    || ''
            };

            element.store('prototype_original_styles', originalStyles);

            var position = getRawStyle(element, 'position'), width = element.offsetWidth;

            if (width === 0 || width === null) {
                element.style.display = 'block';
                width = element.offsetWidth;
            }

            var context = (position === 'fixed') ? document.viewport :
                element.parentNode;

            var tempStyles = {
                visibility: 'hidden',
                display:    'block'
            };

            if (position !== 'fixed') tempStyles.position = 'absolute';

            element.setStyle(tempStyles);

            var positionedWidth = element.offsetWidth, newWidth;
            if (width && (positionedWidth === width)) {
                newWidth = getContentWidth(element, context);
            } else if (position === 'absolute' || position === 'fixed') {
                newWidth = getContentWidth(element, context);
            } else {
                var parent = element.parentNode, pLayout = $(parent).getLayout();

                newWidth = pLayout.get('width') -
                    this.get('margin-left') -
                    this.get('border-left') -
                    this.get('padding-left') -
                    this.get('padding-right') -
                    this.get('border-right') -
                    this.get('margin-right');
            }

            element.setStyle({ width: newWidth + 'px' });

            this._setPrepared(true);
        },

        _end: function() {
            var element = this.element;
            var originalStyles = element.retrieve('prototype_original_styles');
            element.store('prototype_original_styles', null);
            element.setStyle(originalStyles);
            this._setPrepared(false);
        },

        _compute: function(property) {
            var COMPUTATIONS = Element.Layout.COMPUTATIONS;
            if (!(property in COMPUTATIONS)) {
                throw "Property not found.";
            }

            return this._set(property, COMPUTATIONS[property].call(this, this.element));
        },

        _isPrepared: function() {
            return this.element.retrieve('prototype_element_layout_prepared', false);
        },

        _setPrepared: function(bool) {
            return this.element.store('prototype_element_layout_prepared', bool);
        },

        toObject: function() {
            var args = $A(arguments);
            var keys = (args.length === 0) ? Element.Layout.PROPERTIES :
                args.join(' ').split(' ');
            var obj = {};
            keys.each( function(key) {
                if (!Element.Layout.PROPERTIES.include(key)) return;
                var value = this.get(key);
                if (value != null) obj[key] = value;
            }, this);
            return obj;
        },

        toHash: function() {
            var obj = this.toObject.apply(this, arguments);
            return new Hash(obj);
        },

        toCSS: function() {
            var args = $A(arguments);
            var keys = (args.length === 0) ? Element.Layout.PROPERTIES :
                args.join(' ').split(' ');
            var css = {};

            keys.each( function(key) {
                if (!Element.Layout.PROPERTIES.include(key)) return;
                if (Element.Layout.COMPOSITE_PROPERTIES.include(key)) return;

                var value = this.get(key);
                if (value != null) css[cssNameFor(key)] = value + 'px';
            }, this);
            return css;
        },

        inspect: function() {
            return "#<Element.Layout>";
        }
    });

    Object.extend(Element.Layout, {
        PROPERTIES: $w('height width top left right bottom border-left border-right border-top border-bottom padding-left padding-right padding-top padding-bottom margin-top margin-bottom margin-left margin-right padding-box-width padding-box-height border-box-width border-box-height margin-box-width margin-box-height'),

        COMPOSITE_PROPERTIES: $w('padding-box-width padding-box-height margin-box-width margin-box-height border-box-width border-box-height'),

        COMPUTATIONS: {
            'height': function(element) {
                if (!this._preComputing) this._begin();

                var bHeight = this.get('border-box-height');
                if (bHeight <= 0) {
                    if (!this._preComputing) this._end();
                    return 0;
                }

                var bTop = this.get('border-top'),
                    bBottom = this.get('border-bottom');

                var pTop = this.get('padding-top'),
                    pBottom = this.get('padding-bottom');

                if (!this._preComputing) this._end();

                return bHeight - bTop - bBottom - pTop - pBottom;
            },

            'width': function(element) {
                if (!this._preComputing) this._begin();

                var bWidth = this.get('border-box-width');
                if (bWidth <= 0) {
                    if (!this._preComputing) this._end();
                    return 0;
                }

                var bLeft = this.get('border-left'),
                    bRight = this.get('border-right');

                var pLeft = this.get('padding-left'),
                    pRight = this.get('padding-right');

                if (!this._preComputing) this._end();
                return bWidth - bLeft - bRight - pLeft - pRight;
            },

            'padding-box-height': function(element) {
                var height = this.get('height'),
                    pTop = this.get('padding-top'),
                    pBottom = this.get('padding-bottom');

                return height + pTop + pBottom;
            },

            'padding-box-width': function(element) {
                var width = this.get('width'),
                    pLeft = this.get('padding-left'),
                    pRight = this.get('padding-right');

                return width + pLeft + pRight;
            },

            'border-box-height': function(element) {
                if (!this._preComputing) this._begin();
                var height = element.offsetHeight;
                if (!this._preComputing) this._end();
                return height;
            },

            'border-box-width': function(element) {
                if (!this._preComputing) this._begin();
                var width = element.offsetWidth;
                if (!this._preComputing) this._end();
                return width;
            },

            'margin-box-height': function(element) {
                var bHeight = this.get('border-box-height'),
                    mTop = this.get('margin-top'),
                    mBottom = this.get('margin-bottom');

                if (bHeight <= 0) return 0;

                return bHeight + mTop + mBottom;
            },

            'margin-box-width': function(element) {
                var bWidth = this.get('border-box-width'),
                    mLeft = this.get('margin-left'),
                    mRight = this.get('margin-right');

                if (bWidth <= 0) return 0;

                return bWidth + mLeft + mRight;
            },

            'top': function(element) {
                var offset = element.positionedOffset();
                return offset.top;
            },

            'bottom': function(element) {
                var offset = element.positionedOffset(),
                    parent = element.getOffsetParent(),
                    pHeight = parent.measure('height');

                var mHeight = this.get('border-box-height');

                return pHeight - mHeight - offset.top;
            },

            'left': function(element) {
                var offset = element.positionedOffset();
                return offset.left;
            },

            'right': function(element) {
                var offset = element.positionedOffset(),
                    parent = element.getOffsetParent(),
                    pWidth = parent.measure('width');

                var mWidth = this.get('border-box-width');

                return pWidth - mWidth - offset.left;
            },

            'padding-top': function(element) {
                return getPixelValue(element, 'paddingTop');
            },

            'padding-bottom': function(element) {
                return getPixelValue(element, 'paddingBottom');
            },

            'padding-left': function(element) {
                return getPixelValue(element, 'paddingLeft');
            },

            'padding-right': function(element) {
                return getPixelValue(element, 'paddingRight');
            },

            'border-top': function(element) {
                return getPixelValue(element, 'borderTopWidth');
            },

            'border-bottom': function(element) {
                return getPixelValue(element, 'borderBottomWidth');
            },

            'border-left': function(element) {
                return getPixelValue(element, 'borderLeftWidth');
            },

            'border-right': function(element) {
                return getPixelValue(element, 'borderRightWidth');
            },

            'margin-top': function(element) {
                return getPixelValue(element, 'marginTop');
            },

            'margin-bottom': function(element) {
                return getPixelValue(element, 'marginBottom');
            },

            'margin-left': function(element) {
                return getPixelValue(element, 'marginLeft');
            },

            'margin-right': function(element) {
                return getPixelValue(element, 'marginRight');
            }
        }
    });

    if ('getBoundingClientRect' in document.documentElement) {
        Object.extend(Element.Layout.COMPUTATIONS, {
            'right': function(element) {
                var parent = hasLayout(element.getOffsetParent());
                var rect = element.getBoundingClientRect(),
                    pRect = parent.getBoundingClientRect();

                return (pRect.right - rect.right).round();
            },

            'bottom': function(element) {
                var parent = hasLayout(element.getOffsetParent());
                var rect = element.getBoundingClientRect(),
                    pRect = parent.getBoundingClientRect();

                return (pRect.bottom - rect.bottom).round();
            }
        });
    }

    Element.Offset = Class.create({
        initialize: function(left, top) {
            this.left = left.round();
            this.top  = top.round();

            this[0] = this.left;
            this[1] = this.top;
        },

        relativeTo: function(offset) {
            return new Element.Offset(
                this.left - offset.left,
                this.top  - offset.top
            );
        },

        inspect: function() {
            return "#<Element.Offset left: #{left} top: #{top}>".interpolate(this);
        },

        toString: function() {
            return "[#{left}, #{top}]".interpolate(this);
        },

        toArray: function() {
            return [this.left, this.top];
        }
    });

    function getLayout(element, preCompute) {
        return new Element.Layout(element, preCompute);
    }

    function measure(element, property) {
        return $(element).getLayout().get(property);
    }

    function getHeight(element) {
        return Element.getDimensions(element).height;
    }

    function getWidth(element) {
        return Element.getDimensions(element).width;
    }

    function getDimensions(element) {
        element = $(element);
        var display = Element.getStyle(element, 'display');

        if (display && display !== 'none') {
            return { width: element.offsetWidth, height: element.offsetHeight };
        }

        var style = element.style;
        var originalStyles = {
            visibility: style.visibility,
            position:   style.position,
            display:    style.display
        };

        var newStyles = {
            visibility: 'hidden',
            display:    'block'
        };

        if (originalStyles.position !== 'fixed')
            newStyles.position = 'absolute';

        Element.setStyle(element, newStyles);

        var dimensions = {
            width:  element.offsetWidth,
            height: element.offsetHeight
        };

        Element.setStyle(element, originalStyles);

        return dimensions;
    }

    function getOffsetParent(element) {
        element = $(element);

        function selfOrBody(element) {
            return isHtml(element) ? $(document.body) : $(element);
        }

        if (isDocument(element) || isDetached(element) || isBody(element) || isHtml(element))
            return $(document.body);

        var isInline = (Element.getStyle(element, 'display') === 'inline');
        if (!isInline && element.offsetParent) return selfOrBody(element.offsetParent);

        while ((element = element.parentNode) && element !== document.body) {
            if (Element.getStyle(element, 'position') !== 'static') {
                return selfOrBody(element);
            }
        }

        return $(document.body);
    }


    function cumulativeOffset(element) {
        element = $(element);
        var valueT = 0, valueL = 0;
        if (element.parentNode) {
            do {
                valueT += element.offsetTop  || 0;
                valueL += element.offsetLeft || 0;
                element = element.offsetParent;
            } while (element);
        }
        return new Element.Offset(valueL, valueT);
    }

    function positionedOffset(element) {
        element = $(element);

        var layout = element.getLayout();

        var valueT = 0, valueL = 0;
        do {
            valueT += element.offsetTop  || 0;
            valueL += element.offsetLeft || 0;
            element = element.offsetParent;
            if (element) {
                if (isBody(element)) break;
                var p = Element.getStyle(element, 'position');
                if (p !== 'static') break;
            }
        } while (element);

        valueL -= layout.get('margin-left');
        valueT -= layout.get('margin-top');

        return new Element.Offset(valueL, valueT);
    }

    function cumulativeScrollOffset(element) {
        var valueT = 0, valueL = 0;
        do {
            if (element === document.body) {
                var bodyScrollNode = document.documentElement || document.body.parentNode || document.body;
                valueT += !Object.isUndefined(window.pageYOffset) ? window.pageYOffset : bodyScrollNode.scrollTop || 0;
                valueL += !Object.isUndefined(window.pageXOffset) ? window.pageXOffset : bodyScrollNode.scrollLeft || 0;
                break;
            } else {
                valueT += element.scrollTop  || 0;
                valueL += element.scrollLeft || 0;
                element = element.parentNode;
            }
        } while (element);
        return new Element.Offset(valueL, valueT);
    }

    function viewportOffset(forElement) {
        var valueT = 0, valueL = 0, docBody = document.body;

        forElement = $(forElement);
        var element = forElement;
        do {
            valueT += element.offsetTop  || 0;
            valueL += element.offsetLeft || 0;
            if (element.offsetParent == docBody &&
                Element.getStyle(element, 'position') == 'absolute') break;
        } while (element = element.offsetParent);

        element = forElement;
        do {
            if (element != docBody) {
                valueT -= element.scrollTop  || 0;
                valueL -= element.scrollLeft || 0;
            }
        } while (element = element.parentNode);
        return new Element.Offset(valueL, valueT);
    }

    function absolutize(element) {
        element = $(element);

        if (Element.getStyle(element, 'position') === 'absolute') {
            return element;
        }

        var offsetParent = getOffsetParent(element);
        var eOffset = element.viewportOffset(),
            pOffset = offsetParent.viewportOffset();

        var offset = eOffset.relativeTo(pOffset);
        var layout = element.getLayout();

        element.store('prototype_absolutize_original_styles', {
            position: element.getStyle('position'),
            left:     element.getStyle('left'),
            top:      element.getStyle('top'),
            width:    element.getStyle('width'),
            height:   element.getStyle('height')
        });

        element.setStyle({
            position: 'absolute',
            top:    offset.top + 'px',
            left:   offset.left + 'px',
            width:  layout.get('width') + 'px',
            height: layout.get('height') + 'px'
        });

        return element;
    }

    function relativize(element) {
        element = $(element);
        if (Element.getStyle(element, 'position') === 'relative') {
            return element;
        }

        var originalStyles =
            element.retrieve('prototype_absolutize_original_styles');

        if (originalStyles) element.setStyle(originalStyles);
        return element;
    }


    function scrollTo(element) {
        element = $(element);
        var pos = Element.cumulativeOffset(element);
        window.scrollTo(pos.left, pos.top);
        return element;
    }


    function makePositioned(element) {
        element = $(element);
        var position = Element.getStyle(element, 'position'), styles = {};
        if (position === 'static' || !position) {
            styles.position = 'relative';
            if (Prototype.Browser.Opera) {
                styles.top  = 0;
                styles.left = 0;
            }
            Element.setStyle(element, styles);
            Element.store(element, 'prototype_made_positioned', true);
        }
        return element;
    }

    function undoPositioned(element) {
        element = $(element);
        var storage = Element.getStorage(element),
            madePositioned = storage.get('prototype_made_positioned');

        if (madePositioned) {
            storage.unset('prototype_made_positioned');
            Element.setStyle(element, {
                position: '',
                top:      '',
                bottom:   '',
                left:     '',
                right:    ''
            });
        }
        return element;
    }

    function makeClipping(element) {
        element = $(element);

        var storage = Element.getStorage(element),
            madeClipping = storage.get('prototype_made_clipping');

        if (Object.isUndefined(madeClipping)) {
            var overflow = Element.getStyle(element, 'overflow');
            storage.set('prototype_made_clipping', overflow);
            if (overflow !== 'hidden')
                element.style.overflow = 'hidden';
        }

        return element;
    }

    function undoClipping(element) {
        element = $(element);
        var storage = Element.getStorage(element),
            overflow = storage.get('prototype_made_clipping');

        if (!Object.isUndefined(overflow)) {
            storage.unset('prototype_made_clipping');
            element.style.overflow = overflow || '';
        }

        return element;
    }

    function clonePosition(element, source, options) {
        options = Object.extend({
            setLeft:    true,
            setTop:     true,
            setWidth:   true,
            setHeight:  true,
            offsetTop:  0,
            offsetLeft: 0
        }, options || {});

        var docEl = document.documentElement;

        source  = $(source);
        element = $(element);
        var p, delta, layout, styles = {};

        if (options.setLeft || options.setTop) {
            p = Element.viewportOffset(source);
            delta = [0, 0];
            if (Element.getStyle(element, 'position') === 'absolute') {
                var parent = Element.getOffsetParent(element);
                if (parent !== document.body) delta = Element.viewportOffset(parent);
            }
        }

        function pageScrollXY() {
            var x = 0, y = 0;
            if (Object.isNumber(window.pageXOffset)) {
                x = window.pageXOffset;
                y = window.pageYOffset;
            } else if (document.body && (document.body.scrollLeft || document.body.scrollTop)) {
                x = document.body.scrollLeft;
                y = document.body.scrollTop;
            } else if (docEl && (docEl.scrollLeft || docEl.scrollTop)) {
                x = docEl.scrollLeft;
                y = docEl.scrollTop;
            }
            return { x: x, y: y };
        }

        var pageXY = pageScrollXY();


        if (options.setWidth || options.setHeight) {
            layout = Element.getLayout(source);
        }

        if (options.setLeft)
            styles.left = (p[0] + pageXY.x - delta[0] + options.offsetLeft) + 'px';
        if (options.setTop)
            styles.top  = (p[1] + pageXY.y - delta[1] + options.offsetTop)  + 'px';

        var currentLayout = element.getLayout();

        if (options.setWidth) {
            styles.width = layout.get('width')  + 'px';
        }
        if (options.setHeight) {
            styles.height = layout.get('height') + 'px';
        }

        return Element.setStyle(element, styles);
    }


    if (Prototype.Browser.IE) {
        getOffsetParent = getOffsetParent.wrap(
            function(proceed, element) {
                element = $(element);

                if (isDocument(element) || isDetached(element) || isBody(element) || isHtml(element))
                    return $(document.body);

                var position = element.getStyle('position');
                if (position !== 'static') return proceed(element);

                element.setStyle({ position: 'relative' });
                var value = proceed(element);
                element.setStyle({ position: position });
                return value;
            }
        );

        positionedOffset = positionedOffset.wrap(function(proceed, element) {
            element = $(element);
            if (!element.parentNode) return new Element.Offset(0, 0);
            var position = element.getStyle('position');
            if (position !== 'static') return proceed(element);

            var offsetParent = element.getOffsetParent();
            if (offsetParent && offsetParent.getStyle('position') === 'fixed')
                hasLayout(offsetParent);

            element.setStyle({ position: 'relative' });
            var value = proceed(element);
            element.setStyle({ position: position });
            return value;
        });
    } else if (Prototype.Browser.Webkit) {
        cumulativeOffset = function(element) {
            element = $(element);
            var valueT = 0, valueL = 0;
            do {
                valueT += element.offsetTop  || 0;
                valueL += element.offsetLeft || 0;
                if (element.offsetParent == document.body) {
                    if (Element.getStyle(element, 'position') == 'absolute') break;
                }

                element = element.offsetParent;
            } while (element);

            return new Element.Offset(valueL, valueT);
        };
    }


    Element.addMethods({
        getLayout:              getLayout,
        measure:                measure,
        getWidth:               getWidth,
        getHeight:              getHeight,
        getDimensions:          getDimensions,
        getOffsetParent:        getOffsetParent,
        cumulativeOffset:       cumulativeOffset,
        positionedOffset:       positionedOffset,
        cumulativeScrollOffset: cumulativeScrollOffset,
        viewportOffset:         viewportOffset,
        absolutize:             absolutize,
        relativize:             relativize,
        scrollTo:               scrollTo,
        makePositioned:         makePositioned,
        undoPositioned:         undoPositioned,
        makeClipping:           makeClipping,
        undoClipping:           undoClipping,
        clonePosition:          clonePosition
    });

    function isBody(element) {
        return element.nodeName.toUpperCase() === 'BODY';
    }

    function isHtml(element) {
        return element.nodeName.toUpperCase() === 'HTML';
    }

    function isDocument(element) {
        return element.nodeType === Node.DOCUMENT_NODE;
    }

    function isDetached(element) {
        return element !== document.body &&
            !Element.descendantOf(element, document.body);
    }

    if ('getBoundingClientRect' in document.documentElement) {
        Element.addMethods({
            viewportOffset: function(element) {
                element = $(element);
                if (isDetached(element)) return new Element.Offset(0, 0);

                var rect = element.getBoundingClientRect(),
                    docEl = document.documentElement;
                return new Element.Offset(rect.left - docEl.clientLeft,
                    rect.top - docEl.clientTop);
            }
        });
    }


})();

(function() {

    var IS_OLD_OPERA = Prototype.Browser.Opera &&
        (window.parseFloat(window.opera.version()) < 9.5);
    var ROOT = null;
    function getRootElement() {
        if (ROOT) return ROOT;
        ROOT = IS_OLD_OPERA ? document.body : document.documentElement;
        return ROOT;
    }

    function getDimensions() {
        return { width: this.getWidth(), height: this.getHeight() };
    }

    function getWidth() {
        return getRootElement().clientWidth;
    }

    function getHeight() {
        return getRootElement().clientHeight;
    }

    function getScrollOffsets() {
        var x = window.pageXOffset || document.documentElement.scrollLeft ||
            document.body.scrollLeft;
        var y = window.pageYOffset || document.documentElement.scrollTop ||
            document.body.scrollTop;

        return new Element.Offset(x, y);
    }

    document.viewport = {
        getDimensions:    getDimensions,
        getWidth:         getWidth,
        getHeight:        getHeight,
        getScrollOffsets: getScrollOffsets
    };

})();
window.$$ = function() {
    var expression = $A(arguments).join(', ');
    return Prototype.Selector.select(expression, document);
};

Prototype.Selector = (function() {

    function select() {
        throw new Error('Method "Prototype.Selector.select" must be defined.');
    }

    function match() {
        throw new Error('Method "Prototype.Selector.match" must be defined.');
    }

    function find(elements, expression, index) {
        index = index || 0;
        var match = Prototype.Selector.match, length = elements.length, matchIndex = 0, i;

        for (i = 0; i < length; i++) {
            if (match(elements[i], expression) && index == matchIndex++) {
                return Element.extend(elements[i]);
            }
        }
    }

    function extendElements(elements) {
        for (var i = 0, length = elements.length; i < length; i++) {
            Element.extend(elements[i]);
        }
        return elements;
    }


    var K = Prototype.K;

    return {
        select: select,
        match: match,
        find: find,
        extendElements: (Element.extend === K) ? K : extendElements,
        extendElement: Element.extend
    };
})();
Prototype._original_property = window.Sizzle;

(function () {
    function fakeDefine(fn) {
        Prototype._actual_sizzle = fn();
    }
    fakeDefine.amd = true;

    if (typeof define !== 'undefined' && define.amd) {
        Prototype._original_define = define;
        Prototype._actual_sizzle = null;
        window.define = fakeDefine;
    }
})();

/*!
 * Sizzle CSS Selector Engine v1.10.18
 * http://sizzlejs.com/
 *
 * Copyright 2013 jQuery Foundation, Inc. and other contributors
 * Released under the MIT license
 * http://jquery.org/license
 *
 * Date: 2014-02-05
 */
(function( window ) {

    var i,
        support,
        Expr,
        getText,
        isXML,
        compile,
        select,
        outermostContext,
        sortInput,
        hasDuplicate,

        setDocument,
        document,
        docElem,
        documentIsHTML,
        rbuggyQSA,
        rbuggyMatches,
        matches,
        contains,

        expando = "sizzle" + -(new Date()),
        preferredDoc = window.document,
        dirruns = 0,
        done = 0,
        classCache = createCache(),
        tokenCache = createCache(),
        compilerCache = createCache(),
        sortOrder = function( a, b ) {
            if ( a === b ) {
                hasDuplicate = true;
            }
            return 0;
        },

        strundefined = typeof undefined,
        MAX_NEGATIVE = 1 << 31,

        hasOwn = ({}).hasOwnProperty,
        arr = [],
        pop = arr.pop,
        push_native = arr.push,
        push = arr.push,
        slice = arr.slice,
        indexOf = arr.indexOf || function( elem ) {
                var i = 0,
                    len = this.length;
                for ( ; i < len; i++ ) {
                    if ( this[i] === elem ) {
                        return i;
                    }
                }
                return -1;
            },

        booleans = "checked|selected|async|autofocus|autoplay|controls|defer|disabled|hidden|ismap|loop|multiple|open|readonly|required|scoped",


        whitespace = "[\\x20\\t\\r\\n\\f]",
        characterEncoding = "(?:\\\\.|[\\w-]|[^\\x00-\\xa0])+",

        identifier = characterEncoding.replace( "w", "w#" ),

        attributes = "\\[" + whitespace + "*(" + characterEncoding + ")" + whitespace +
            "*(?:([*^$|!~]?=)" + whitespace + "*(?:(['\"])((?:\\\\.|[^\\\\])*?)\\3|(" + identifier + ")|)|)" + whitespace + "*\\]",

        pseudos = ":(" + characterEncoding + ")(?:\\(((['\"])((?:\\\\.|[^\\\\])*?)\\3|((?:\\\\.|[^\\\\()[\\]]|" + attributes.replace( 3, 8 ) + ")*)|.*)\\)|)",

        rtrim = new RegExp( "^" + whitespace + "+|((?:^|[^\\\\])(?:\\\\.)*)" + whitespace + "+$", "g" ),

        rcomma = new RegExp( "^" + whitespace + "*," + whitespace + "*" ),
        rcombinators = new RegExp( "^" + whitespace + "*([>+~]|" + whitespace + ")" + whitespace + "*" ),

        rattributeQuotes = new RegExp( "=" + whitespace + "*([^\\]'\"]*?)" + whitespace + "*\\]", "g" ),

        rpseudo = new RegExp( pseudos ),
        ridentifier = new RegExp( "^" + identifier + "$" ),

        matchExpr = {
            "ID": new RegExp( "^#(" + characterEncoding + ")" ),
            "CLASS": new RegExp( "^\\.(" + characterEncoding + ")" ),
            "TAG": new RegExp( "^(" + characterEncoding.replace( "w", "w*" ) + ")" ),
            "ATTR": new RegExp( "^" + attributes ),
            "PSEUDO": new RegExp( "^" + pseudos ),
            "CHILD": new RegExp( "^:(only|first|last|nth|nth-last)-(child|of-type)(?:\\(" + whitespace +
                "*(even|odd|(([+-]|)(\\d*)n|)" + whitespace + "*(?:([+-]|)" + whitespace +
                "*(\\d+)|))" + whitespace + "*\\)|)", "i" ),
            "bool": new RegExp( "^(?:" + booleans + ")$", "i" ),
            "needsContext": new RegExp( "^" + whitespace + "*[>+~]|:(even|odd|eq|gt|lt|nth|first|last)(?:\\(" +
                whitespace + "*((?:-\\d)?\\d*)" + whitespace + "*\\)|)(?=[^-]|$)", "i" )
        },

        rinputs = /^(?:input|select|textarea|button)$/i,
        rheader = /^h\d$/i,

        rnative = /^[^{]+\{\s*\[native \w/,

        rquickExpr = /^(?:#([\w-]+)|(\w+)|\.([\w-]+))$/,

        rsibling = /[+~]/,
        rescape = /'|\\/g,

        runescape = new RegExp( "\\\\([\\da-f]{1,6}" + whitespace + "?|(" + whitespace + ")|.)", "ig" ),
        funescape = function( _, escaped, escapedWhitespace ) {
            var high = "0x" + escaped - 0x10000;
            return high !== high || escapedWhitespace ?
                escaped :
                high < 0 ?
                    String.fromCharCode( high + 0x10000 ) :
                    String.fromCharCode( high >> 10 | 0xD800, high & 0x3FF | 0xDC00 );
        };

    try {
        push.apply(
            (arr = slice.call( preferredDoc.childNodes )),
            preferredDoc.childNodes
        );
        arr[ preferredDoc.childNodes.length ].nodeType;
    } catch ( e ) {
        push = { apply: arr.length ?

            function( target, els ) {
                push_native.apply( target, slice.call(els) );
            } :

            function( target, els ) {
                var j = target.length,
                    i = 0;
                while ( (target[j++] = els[i++]) ) {}
                target.length = j - 1;
            }
        };
    }

    function Sizzle( selector, context, results, seed ) {
        var match, elem, m, nodeType,
            i, groups, old, nid, newContext, newSelector;

        if ( ( context ? context.ownerDocument || context : preferredDoc ) !== document ) {
            setDocument( context );
        }

        context = context || document;
        results = results || [];

        if ( !selector || typeof selector !== "string" ) {
            return results;
        }

        if ( (nodeType = context.nodeType) !== 1 && nodeType !== 9 ) {
            return [];
        }

        if ( documentIsHTML && !seed ) {

            if ( (match = rquickExpr.exec( selector )) ) {
                if ( (m = match[1]) ) {
                    if ( nodeType === 9 ) {
                        elem = context.getElementById( m );
                        if ( elem && elem.parentNode ) {
                            if ( elem.id === m ) {
                                results.push( elem );
                                return results;
                            }
                        } else {
                            return results;
                        }
                    } else {
                        if ( context.ownerDocument && (elem = context.ownerDocument.getElementById( m )) &&
                            contains( context, elem ) && elem.id === m ) {
                            results.push( elem );
                            return results;
                        }
                    }

                } else if ( match[2] ) {
                    push.apply( results, context.getElementsByTagName( selector ) );
                    return results;

                } else if ( (m = match[3]) && support.getElementsByClassName && context.getElementsByClassName ) {
                    push.apply( results, context.getElementsByClassName( m ) );
                    return results;
                }
            }

            if ( support.qsa && (!rbuggyQSA || !rbuggyQSA.test( selector )) ) {
                nid = old = expando;
                newContext = context;
                newSelector = nodeType === 9 && selector;

                if ( nodeType === 1 && context.nodeName.toLowerCase() !== "object" ) {
                    groups = tokenize( selector );

                    if ( (old = context.getAttribute("id")) ) {
                        nid = old.replace( rescape, "\\$&" );
                    } else {
                        context.setAttribute( "id", nid );
                    }
                    nid = "[id='" + nid + "'] ";

                    i = groups.length;
                    while ( i-- ) {
                        groups[i] = nid + toSelector( groups[i] );
                    }
                    newContext = rsibling.test( selector ) && testContext( context.parentNode ) || context;
                    newSelector = groups.join(",");
                }

                if ( newSelector ) {
                    try {
                        push.apply( results,
                            newContext.querySelectorAll( newSelector )
                        );
                        return results;
                    } catch(qsaError) {
                    } finally {
                        if ( !old ) {
                            context.removeAttribute("id");
                        }
                    }
                }
            }
        }

        return select( selector.replace( rtrim, "$1" ), context, results, seed );
    }

    /**
     * Create key-value caches of limited size
     * @returns {Function(string, Object)} Returns the Object data after storing it on itself with
     *	property name the (space-suffixed) string and (if the cache is larger than Expr.cacheLength)
     *	deleting the oldest entry
     */
    function createCache() {
        var keys = [];

        function cache( key, value ) {
            if ( keys.push( key + " " ) > Expr.cacheLength ) {
                delete cache[ keys.shift() ];
            }
            return (cache[ key + " " ] = value);
        }
        return cache;
    }

    /**
     * Mark a function for special use by Sizzle
     * @param {Function} fn The function to mark
     */
    function markFunction( fn ) {
        fn[ expando ] = true;
        return fn;
    }

    /**
     * Support testing using an element
     * @param {Function} fn Passed the created div and expects a boolean result
     */
    function assert( fn ) {
        var div = document.createElement("div");

        try {
            return !!fn( div );
        } catch (e) {
            return false;
        } finally {
            if ( div.parentNode ) {
                div.parentNode.removeChild( div );
            }
            div = null;
        }
    }

    /**
     * Adds the same handler for all of the specified attrs
     * @param {String} attrs Pipe-separated list of attributes
     * @param {Function} handler The method that will be applied
     */
    function addHandle( attrs, handler ) {
        var arr = attrs.split("|"),
            i = attrs.length;

        while ( i-- ) {
            Expr.attrHandle[ arr[i] ] = handler;
        }
    }

    /**
     * Checks document order of two siblings
     * @param {Element} a
     * @param {Element} b
     * @returns {Number} Returns less than 0 if a precedes b, greater than 0 if a follows b
     */
    function siblingCheck( a, b ) {
        var cur = b && a,
            diff = cur && a.nodeType === 1 && b.nodeType === 1 &&
                ( ~b.sourceIndex || MAX_NEGATIVE ) -
                ( ~a.sourceIndex || MAX_NEGATIVE );

        if ( diff ) {
            return diff;
        }

        if ( cur ) {
            while ( (cur = cur.nextSibling) ) {
                if ( cur === b ) {
                    return -1;
                }
            }
        }

        return a ? 1 : -1;
    }

    /**
     * Returns a function to use in pseudos for input types
     * @param {String} type
     */
    function createInputPseudo( type ) {
        return function( elem ) {
            var name = elem.nodeName.toLowerCase();
            return name === "input" && elem.type === type;
        };
    }

    /**
     * Returns a function to use in pseudos for buttons
     * @param {String} type
     */
    function createButtonPseudo( type ) {
        return function( elem ) {
            var name = elem.nodeName.toLowerCase();
            return (name === "input" || name === "button") && elem.type === type;
        };
    }

    /**
     * Returns a function to use in pseudos for positionals
     * @param {Function} fn
     */
    function createPositionalPseudo( fn ) {
        return markFunction(function( argument ) {
            argument = +argument;
            return markFunction(function( seed, matches ) {
                var j,
                    matchIndexes = fn( [], seed.length, argument ),
                    i = matchIndexes.length;

                while ( i-- ) {
                    if ( seed[ (j = matchIndexes[i]) ] ) {
                        seed[j] = !(matches[j] = seed[j]);
                    }
                }
            });
        });
    }

    /**
     * Checks a node for validity as a Sizzle context
     * @param {Element|Object=} context
     * @returns {Element|Object|Boolean} The input node if acceptable, otherwise a falsy value
     */
    function testContext( context ) {
        return context && typeof context.getElementsByTagName !== strundefined && context;
    }

    support = Sizzle.support = {};

    /**
     * Detects XML nodes
     * @param {Element|Object} elem An element or a document
     * @returns {Boolean} True iff elem is a non-HTML XML node
     */
    isXML = Sizzle.isXML = function( elem ) {
        var documentElement = elem && (elem.ownerDocument || elem).documentElement;
        return documentElement ? documentElement.nodeName !== "HTML" : false;
    };

    /**
     * Sets document-related variables once based on the current document
     * @param {Element|Object} [doc] An element or document object to use to set the document
     * @returns {Object} Returns the current document
     */
    setDocument = Sizzle.setDocument = function( node ) {
        var hasCompare,
            doc = node ? node.ownerDocument || node : preferredDoc,
            parent = doc.defaultView;

        if ( doc === document || doc.nodeType !== 9 || !doc.documentElement ) {
            return document;
        }

        document = doc;
        docElem = doc.documentElement;

        documentIsHTML = !isXML( doc );

        if ( parent && parent !== parent.top ) {
            if ( parent.addEventListener ) {
                parent.addEventListener( "unload", function() {
                    setDocument();
                }, false );
            } else if ( parent.attachEvent ) {
                parent.attachEvent( "onunload", function() {
                    setDocument();
                });
            }
        }

        /* Attributes
         ---------------------------------------------------------------------- */

        support.attributes = assert(function( div ) {
            div.className = "i";
            return !div.getAttribute("className");
        });

        /* getElement(s)By*
         ---------------------------------------------------------------------- */

        support.getElementsByTagName = assert(function( div ) {
            div.appendChild( doc.createComment("") );
            return !div.getElementsByTagName("*").length;
        });

        support.getElementsByClassName = rnative.test( doc.getElementsByClassName ) && assert(function( div ) {
                div.innerHTML = "<div class='a'></div><div class='a i'></div>";

                div.firstChild.className = "i";
                return div.getElementsByClassName("i").length === 2;
            });

        support.getById = assert(function( div ) {
            docElem.appendChild( div ).id = expando;
            return !doc.getElementsByName || !doc.getElementsByName( expando ).length;
        });

        if ( support.getById ) {
            Expr.find["ID"] = function( id, context ) {
                if ( typeof context.getElementById !== strundefined && documentIsHTML ) {
                    var m = context.getElementById( id );
                    return m && m.parentNode ? [m] : [];
                }
            };
            Expr.filter["ID"] = function( id ) {
                var attrId = id.replace( runescape, funescape );
                return function( elem ) {
                    return elem.getAttribute("id") === attrId;
                };
            };
        } else {
            delete Expr.find["ID"];

            Expr.filter["ID"] =  function( id ) {
                var attrId = id.replace( runescape, funescape );
                return function( elem ) {
                    var node = typeof elem.getAttributeNode !== strundefined && elem.getAttributeNode("id");
                    return node && node.value === attrId;
                };
            };
        }

        Expr.find["TAG"] = support.getElementsByTagName ?
            function( tag, context ) {
                if ( typeof context.getElementsByTagName !== strundefined ) {
                    return context.getElementsByTagName( tag );
                }
            } :
            function( tag, context ) {
                var elem,
                    tmp = [],
                    i = 0,
                    results = context.getElementsByTagName( tag );

                if ( tag === "*" ) {
                    while ( (elem = results[i++]) ) {
                        if ( elem.nodeType === 1 ) {
                            tmp.push( elem );
                        }
                    }

                    return tmp;
                }
                return results;
            };

        Expr.find["CLASS"] = support.getElementsByClassName && function( className, context ) {
                if ( typeof context.getElementsByClassName !== strundefined && documentIsHTML ) {
                    return context.getElementsByClassName( className );
                }
            };

        /* QSA/matchesSelector
         ---------------------------------------------------------------------- */


        rbuggyMatches = [];

        rbuggyQSA = [];

        if ( (support.qsa = rnative.test( doc.querySelectorAll )) ) {
            assert(function( div ) {
                div.innerHTML = "<select t=''><option selected=''></option></select>";

                if ( div.querySelectorAll("[t^='']").length ) {
                    rbuggyQSA.push( "[*^$]=" + whitespace + "*(?:''|\"\")" );
                }

                if ( !div.querySelectorAll("[selected]").length ) {
                    rbuggyQSA.push( "\\[" + whitespace + "*(?:value|" + booleans + ")" );
                }

                if ( !div.querySelectorAll(":checked").length ) {
                    rbuggyQSA.push(":checked");
                }
            });

            assert(function( div ) {
                var input = doc.createElement("input");
                input.setAttribute( "type", "hidden" );
                div.appendChild( input ).setAttribute( "name", "D" );

                if ( div.querySelectorAll("[name=d]").length ) {
                    rbuggyQSA.push( "name" + whitespace + "*[*^$|!~]?=" );
                }

                if ( !div.querySelectorAll(":enabled").length ) {
                    rbuggyQSA.push( ":enabled", ":disabled" );
                }

                div.querySelectorAll("*,:x");
                rbuggyQSA.push(",.*:");
            });
        }

        if ( (support.matchesSelector = rnative.test( (matches = docElem.webkitMatchesSelector ||
                docElem.mozMatchesSelector ||
                docElem.oMatchesSelector ||
                docElem.msMatchesSelector) )) ) {

            assert(function( div ) {
                support.disconnectedMatch = matches.call( div, "div" );

                matches.call( div, "[s!='']:x" );
                rbuggyMatches.push( "!=", pseudos );
            });
        }

        rbuggyQSA = rbuggyQSA.length && new RegExp( rbuggyQSA.join("|") );
        rbuggyMatches = rbuggyMatches.length && new RegExp( rbuggyMatches.join("|") );

        /* Contains
         ---------------------------------------------------------------------- */
        hasCompare = rnative.test( docElem.compareDocumentPosition );

        contains = hasCompare || rnative.test( docElem.contains ) ?
            function( a, b ) {
                var adown = a.nodeType === 9 ? a.documentElement : a,
                    bup = b && b.parentNode;
                return a === bup || !!( bup && bup.nodeType === 1 && (
                        adown.contains ?
                            adown.contains( bup ) :
                        a.compareDocumentPosition && a.compareDocumentPosition( bup ) & 16
                    ));
            } :
            function( a, b ) {
                if ( b ) {
                    while ( (b = b.parentNode) ) {
                        if ( b === a ) {
                            return true;
                        }
                    }
                }
                return false;
            };

        /* Sorting
         ---------------------------------------------------------------------- */

        sortOrder = hasCompare ?
            function( a, b ) {

                if ( a === b ) {
                    hasDuplicate = true;
                    return 0;
                }

                var compare = !a.compareDocumentPosition - !b.compareDocumentPosition;
                if ( compare ) {
                    return compare;
                }

                compare = ( a.ownerDocument || a ) === ( b.ownerDocument || b ) ?
                    a.compareDocumentPosition( b ) :

                    1;

                if ( compare & 1 ||
                    (!support.sortDetached && b.compareDocumentPosition( a ) === compare) ) {

                    if ( a === doc || a.ownerDocument === preferredDoc && contains(preferredDoc, a) ) {
                        return -1;
                    }
                    if ( b === doc || b.ownerDocument === preferredDoc && contains(preferredDoc, b) ) {
                        return 1;
                    }

                    return sortInput ?
                        ( indexOf.call( sortInput, a ) - indexOf.call( sortInput, b ) ) :
                        0;
                }

                return compare & 4 ? -1 : 1;
            } :
            function( a, b ) {
                if ( a === b ) {
                    hasDuplicate = true;
                    return 0;
                }

                var cur,
                    i = 0,
                    aup = a.parentNode,
                    bup = b.parentNode,
                    ap = [ a ],
                    bp = [ b ];

                if ( !aup || !bup ) {
                    return a === doc ? -1 :
                        b === doc ? 1 :
                            aup ? -1 :
                                bup ? 1 :
                                    sortInput ?
                                        ( indexOf.call( sortInput, a ) - indexOf.call( sortInput, b ) ) :
                                        0;

                } else if ( aup === bup ) {
                    return siblingCheck( a, b );
                }

                cur = a;
                while ( (cur = cur.parentNode) ) {
                    ap.unshift( cur );
                }
                cur = b;
                while ( (cur = cur.parentNode) ) {
                    bp.unshift( cur );
                }

                while ( ap[i] === bp[i] ) {
                    i++;
                }

                return i ?
                    siblingCheck( ap[i], bp[i] ) :

                    ap[i] === preferredDoc ? -1 :
                        bp[i] === preferredDoc ? 1 :
                            0;
            };

        return doc;
    };

    Sizzle.matches = function( expr, elements ) {
        return Sizzle( expr, null, null, elements );
    };

    Sizzle.matchesSelector = function( elem, expr ) {
        if ( ( elem.ownerDocument || elem ) !== document ) {
            setDocument( elem );
        }

        expr = expr.replace( rattributeQuotes, "='$1']" );

        if ( support.matchesSelector && documentIsHTML &&
            ( !rbuggyMatches || !rbuggyMatches.test( expr ) ) &&
            ( !rbuggyQSA     || !rbuggyQSA.test( expr ) ) ) {

            try {
                var ret = matches.call( elem, expr );

                if ( ret || support.disconnectedMatch ||
                    elem.document && elem.document.nodeType !== 11 ) {
                    return ret;
                }
            } catch(e) {}
        }

        return Sizzle( expr, document, null, [elem] ).length > 0;
    };

    Sizzle.contains = function( context, elem ) {
        if ( ( context.ownerDocument || context ) !== document ) {
            setDocument( context );
        }
        return contains( context, elem );
    };

    Sizzle.attr = function( elem, name ) {
        if ( ( elem.ownerDocument || elem ) !== document ) {
            setDocument( elem );
        }

        var fn = Expr.attrHandle[ name.toLowerCase() ],
            val = fn && hasOwn.call( Expr.attrHandle, name.toLowerCase() ) ?
                fn( elem, name, !documentIsHTML ) :
                undefined;

        return val !== undefined ?
            val :
            support.attributes || !documentIsHTML ?
                elem.getAttribute( name ) :
                (val = elem.getAttributeNode(name)) && val.specified ?
                    val.value :
                    null;
    };

    Sizzle.error = function( msg ) {
        throw new Error( "Syntax error, unrecognized expression: " + msg );
    };

    /**
     * Document sorting and removing duplicates
     * @param {ArrayLike} results
     */
    Sizzle.uniqueSort = function( results ) {
        var elem,
            duplicates = [],
            j = 0,
            i = 0;

        hasDuplicate = !support.detectDuplicates;
        sortInput = !support.sortStable && results.slice( 0 );
        results.sort( sortOrder );

        if ( hasDuplicate ) {
            while ( (elem = results[i++]) ) {
                if ( elem === results[ i ] ) {
                    j = duplicates.push( i );
                }
            }
            while ( j-- ) {
                results.splice( duplicates[ j ], 1 );
            }
        }

        sortInput = null;

        return results;
    };

    /**
     * Utility function for retrieving the text value of an array of DOM nodes
     * @param {Array|Element} elem
     */
    getText = Sizzle.getText = function( elem ) {
        var node,
            ret = "",
            i = 0,
            nodeType = elem.nodeType;

        if ( !nodeType ) {
            while ( (node = elem[i++]) ) {
                ret += getText( node );
            }
        } else if ( nodeType === 1 || nodeType === 9 || nodeType === 11 ) {
            if ( typeof elem.textContent === "string" ) {
                return elem.textContent;
            } else {
                for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {
                    ret += getText( elem );
                }
            }
        } else if ( nodeType === 3 || nodeType === 4 ) {
            return elem.nodeValue;
        }

        return ret;
    };

    Expr = Sizzle.selectors = {

        cacheLength: 50,

        createPseudo: markFunction,

        match: matchExpr,

        attrHandle: {},

        find: {},

        relative: {
            ">": { dir: "parentNode", first: true },
            " ": { dir: "parentNode" },
            "+": { dir: "previousSibling", first: true },
            "~": { dir: "previousSibling" }
        },

        preFilter: {
            "ATTR": function( match ) {
                match[1] = match[1].replace( runescape, funescape );

                match[3] = ( match[4] || match[5] || "" ).replace( runescape, funescape );

                if ( match[2] === "~=" ) {
                    match[3] = " " + match[3] + " ";
                }

                return match.slice( 0, 4 );
            },

            "CHILD": function( match ) {
                /* matches from matchExpr["CHILD"]
                 1 type (only|nth|...)
                 2 what (child|of-type)
                 3 argument (even|odd|\d*|\d*n([+-]\d+)?|...)
                 4 xn-component of xn+y argument ([+-]?\d*n|)
                 5 sign of xn-component
                 6 x of xn-component
                 7 sign of y-component
                 8 y of y-component
                 */
                match[1] = match[1].toLowerCase();

                if ( match[1].slice( 0, 3 ) === "nth" ) {
                    if ( !match[3] ) {
                        Sizzle.error( match[0] );
                    }

                    match[4] = +( match[4] ? match[5] + (match[6] || 1) : 2 * ( match[3] === "even" || match[3] === "odd" ) );
                    match[5] = +( ( match[7] + match[8] ) || match[3] === "odd" );

                } else if ( match[3] ) {
                    Sizzle.error( match[0] );
                }

                return match;
            },

            "PSEUDO": function( match ) {
                var excess,
                    unquoted = !match[5] && match[2];

                if ( matchExpr["CHILD"].test( match[0] ) ) {
                    return null;
                }

                if ( match[3] && match[4] !== undefined ) {
                    match[2] = match[4];

                } else if ( unquoted && rpseudo.test( unquoted ) &&
                    (excess = tokenize( unquoted, true )) &&
                    (excess = unquoted.indexOf( ")", unquoted.length - excess ) - unquoted.length) ) {

                    match[0] = match[0].slice( 0, excess );
                    match[2] = unquoted.slice( 0, excess );
                }

                return match.slice( 0, 3 );
            }
        },

        filter: {

            "TAG": function( nodeNameSelector ) {
                var nodeName = nodeNameSelector.replace( runescape, funescape ).toLowerCase();
                return nodeNameSelector === "*" ?
                    function() { return true; } :
                    function( elem ) {
                        return elem.nodeName && elem.nodeName.toLowerCase() === nodeName;
                    };
            },

            "CLASS": function( className ) {
                var pattern = classCache[ className + " " ];

                return pattern ||
                    (pattern = new RegExp( "(^|" + whitespace + ")" + className + "(" + whitespace + "|$)" )) &&
                    classCache( className, function( elem ) {
                        return pattern.test( typeof elem.className === "string" && elem.className || typeof elem.getAttribute !== strundefined && elem.getAttribute("class") || "" );
                    });
            },

            "ATTR": function( name, operator, check ) {
                return function( elem ) {
                    var result = Sizzle.attr( elem, name );

                    if ( result == null ) {
                        return operator === "!=";
                    }
                    if ( !operator ) {
                        return true;
                    }

                    result += "";

                    return operator === "=" ? result === check :
                        operator === "!=" ? result !== check :
                            operator === "^=" ? check && result.indexOf( check ) === 0 :
                                operator === "*=" ? check && result.indexOf( check ) > -1 :
                                    operator === "$=" ? check && result.slice( -check.length ) === check :
                                        operator === "~=" ? ( " " + result + " " ).indexOf( check ) > -1 :
                                            operator === "|=" ? result === check || result.slice( 0, check.length + 1 ) === check + "-" :
                                                false;
                };
            },

            "CHILD": function( type, what, argument, first, last ) {
                var simple = type.slice( 0, 3 ) !== "nth",
                    forward = type.slice( -4 ) !== "last",
                    ofType = what === "of-type";

                return first === 1 && last === 0 ?

                    function( elem ) {
                        return !!elem.parentNode;
                    } :

                    function( elem, context, xml ) {
                        var cache, outerCache, node, diff, nodeIndex, start,
                            dir = simple !== forward ? "nextSibling" : "previousSibling",
                            parent = elem.parentNode,
                            name = ofType && elem.nodeName.toLowerCase(),
                            useCache = !xml && !ofType;

                        if ( parent ) {

                            if ( simple ) {
                                while ( dir ) {
                                    node = elem;
                                    while ( (node = node[ dir ]) ) {
                                        if ( ofType ? node.nodeName.toLowerCase() === name : node.nodeType === 1 ) {
                                            return false;
                                        }
                                    }
                                    start = dir = type === "only" && !start && "nextSibling";
                                }
                                return true;
                            }

                            start = [ forward ? parent.firstChild : parent.lastChild ];

                            if ( forward && useCache ) {
                                outerCache = parent[ expando ] || (parent[ expando ] = {});
                                cache = outerCache[ type ] || [];
                                nodeIndex = cache[0] === dirruns && cache[1];
                                diff = cache[0] === dirruns && cache[2];
                                node = nodeIndex && parent.childNodes[ nodeIndex ];

                                while ( (node = ++nodeIndex && node && node[ dir ] ||

                                    (diff = nodeIndex = 0) || start.pop()) ) {

                                    if ( node.nodeType === 1 && ++diff && node === elem ) {
                                        outerCache[ type ] = [ dirruns, nodeIndex, diff ];
                                        break;
                                    }
                                }

                            } else if ( useCache && (cache = (elem[ expando ] || (elem[ expando ] = {}))[ type ]) && cache[0] === dirruns ) {
                                diff = cache[1];

                            } else {
                                while ( (node = ++nodeIndex && node && node[ dir ] ||
                                    (diff = nodeIndex = 0) || start.pop()) ) {

                                    if ( ( ofType ? node.nodeName.toLowerCase() === name : node.nodeType === 1 ) && ++diff ) {
                                        if ( useCache ) {
                                            (node[ expando ] || (node[ expando ] = {}))[ type ] = [ dirruns, diff ];
                                        }

                                        if ( node === elem ) {
                                            break;
                                        }
                                    }
                                }
                            }

                            diff -= last;
                            return diff === first || ( diff % first === 0 && diff / first >= 0 );
                        }
                    };
            },

            "PSEUDO": function( pseudo, argument ) {
                var args,
                    fn = Expr.pseudos[ pseudo ] || Expr.setFilters[ pseudo.toLowerCase() ] ||
                        Sizzle.error( "unsupported pseudo: " + pseudo );

                if ( fn[ expando ] ) {
                    return fn( argument );
                }

                if ( fn.length > 1 ) {
                    args = [ pseudo, pseudo, "", argument ];
                    return Expr.setFilters.hasOwnProperty( pseudo.toLowerCase() ) ?
                        markFunction(function( seed, matches ) {
                            var idx,
                                matched = fn( seed, argument ),
                                i = matched.length;
                            while ( i-- ) {
                                idx = indexOf.call( seed, matched[i] );
                                seed[ idx ] = !( matches[ idx ] = matched[i] );
                            }
                        }) :
                        function( elem ) {
                            return fn( elem, 0, args );
                        };
                }

                return fn;
            }
        },

        pseudos: {
            "not": markFunction(function( selector ) {
                var input = [],
                    results = [],
                    matcher = compile( selector.replace( rtrim, "$1" ) );

                return matcher[ expando ] ?
                    markFunction(function( seed, matches, context, xml ) {
                        var elem,
                            unmatched = matcher( seed, null, xml, [] ),
                            i = seed.length;

                        while ( i-- ) {
                            if ( (elem = unmatched[i]) ) {
                                seed[i] = !(matches[i] = elem);
                            }
                        }
                    }) :
                    function( elem, context, xml ) {
                        input[0] = elem;
                        matcher( input, null, xml, results );
                        return !results.pop();
                    };
            }),

            "has": markFunction(function( selector ) {
                return function( elem ) {
                    return Sizzle( selector, elem ).length > 0;
                };
            }),

            "contains": markFunction(function( text ) {
                return function( elem ) {
                    return ( elem.textContent || elem.innerText || getText( elem ) ).indexOf( text ) > -1;
                };
            }),

            "lang": markFunction( function( lang ) {
                if ( !ridentifier.test(lang || "") ) {
                    Sizzle.error( "unsupported lang: " + lang );
                }
                lang = lang.replace( runescape, funescape ).toLowerCase();
                return function( elem ) {
                    var elemLang;
                    do {
                        if ( (elemLang = documentIsHTML ?
                                elem.lang :
                            elem.getAttribute("xml:lang") || elem.getAttribute("lang")) ) {

                            elemLang = elemLang.toLowerCase();
                            return elemLang === lang || elemLang.indexOf( lang + "-" ) === 0;
                        }
                    } while ( (elem = elem.parentNode) && elem.nodeType === 1 );
                    return false;
                };
            }),

            "target": function( elem ) {
                var hash = window.location && window.location.hash;
                return hash && hash.slice( 1 ) === elem.id;
            },

            "root": function( elem ) {
                return elem === docElem;
            },

            "focus": function( elem ) {
                return elem === document.activeElement && (!document.hasFocus || document.hasFocus()) && !!(elem.type || elem.href || ~elem.tabIndex);
            },

            "enabled": function( elem ) {
                return elem.disabled === false;
            },

            "disabled": function( elem ) {
                return elem.disabled === true;
            },

            "checked": function( elem ) {
                var nodeName = elem.nodeName.toLowerCase();
                return (nodeName === "input" && !!elem.checked) || (nodeName === "option" && !!elem.selected);
            },

            "selected": function( elem ) {
                if ( elem.parentNode ) {
                    elem.parentNode.selectedIndex;
                }

                return elem.selected === true;
            },

            "empty": function( elem ) {
                for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {
                    if ( elem.nodeType < 6 ) {
                        return false;
                    }
                }
                return true;
            },

            "parent": function( elem ) {
                return !Expr.pseudos["empty"]( elem );
            },

            "header": function( elem ) {
                return rheader.test( elem.nodeName );
            },

            "input": function( elem ) {
                return rinputs.test( elem.nodeName );
            },

            "button": function( elem ) {
                var name = elem.nodeName.toLowerCase();
                return name === "input" && elem.type === "button" || name === "button";
            },

            "text": function( elem ) {
                var attr;
                return elem.nodeName.toLowerCase() === "input" &&
                    elem.type === "text" &&

                    ( (attr = elem.getAttribute("type")) == null || attr.toLowerCase() === "text" );
            },

            "first": createPositionalPseudo(function() {
                return [ 0 ];
            }),

            "last": createPositionalPseudo(function( matchIndexes, length ) {
                return [ length - 1 ];
            }),

            "eq": createPositionalPseudo(function( matchIndexes, length, argument ) {
                return [ argument < 0 ? argument + length : argument ];
            }),

            "even": createPositionalPseudo(function( matchIndexes, length ) {
                var i = 0;
                for ( ; i < length; i += 2 ) {
                    matchIndexes.push( i );
                }
                return matchIndexes;
            }),

            "odd": createPositionalPseudo(function( matchIndexes, length ) {
                var i = 1;
                for ( ; i < length; i += 2 ) {
                    matchIndexes.push( i );
                }
                return matchIndexes;
            }),

            "lt": createPositionalPseudo(function( matchIndexes, length, argument ) {
                var i = argument < 0 ? argument + length : argument;
                for ( ; --i >= 0; ) {
                    matchIndexes.push( i );
                }
                return matchIndexes;
            }),

            "gt": createPositionalPseudo(function( matchIndexes, length, argument ) {
                var i = argument < 0 ? argument + length : argument;
                for ( ; ++i < length; ) {
                    matchIndexes.push( i );
                }
                return matchIndexes;
            })
        }
    };

    Expr.pseudos["nth"] = Expr.pseudos["eq"];

    for ( i in { radio: true, checkbox: true, file: true, password: true, image: true } ) {
        Expr.pseudos[ i ] = createInputPseudo( i );
    }
    for ( i in { submit: true, reset: true } ) {
        Expr.pseudos[ i ] = createButtonPseudo( i );
    }

    function setFilters() {}
    setFilters.prototype = Expr.filters = Expr.pseudos;
    Expr.setFilters = new setFilters();

    function tokenize( selector, parseOnly ) {
        var matched, match, tokens, type,
            soFar, groups, preFilters,
            cached = tokenCache[ selector + " " ];

        if ( cached ) {
            return parseOnly ? 0 : cached.slice( 0 );
        }

        soFar = selector;
        groups = [];
        preFilters = Expr.preFilter;

        while ( soFar ) {

            if ( !matched || (match = rcomma.exec( soFar )) ) {
                if ( match ) {
                    soFar = soFar.slice( match[0].length ) || soFar;
                }
                groups.push( (tokens = []) );
            }

            matched = false;

            if ( (match = rcombinators.exec( soFar )) ) {
                matched = match.shift();
                tokens.push({
                    value: matched,
                    type: match[0].replace( rtrim, " " )
                });
                soFar = soFar.slice( matched.length );
            }

            for ( type in Expr.filter ) {
                if ( (match = matchExpr[ type ].exec( soFar )) && (!preFilters[ type ] ||
                    (match = preFilters[ type ]( match ))) ) {
                    matched = match.shift();
                    tokens.push({
                        value: matched,
                        type: type,
                        matches: match
                    });
                    soFar = soFar.slice( matched.length );
                }
            }

            if ( !matched ) {
                break;
            }
        }

        return parseOnly ?
            soFar.length :
            soFar ?
                Sizzle.error( selector ) :
                tokenCache( selector, groups ).slice( 0 );
    }

    function toSelector( tokens ) {
        var i = 0,
            len = tokens.length,
            selector = "";
        for ( ; i < len; i++ ) {
            selector += tokens[i].value;
        }
        return selector;
    }

    function addCombinator( matcher, combinator, base ) {
        var dir = combinator.dir,
            checkNonElements = base && dir === "parentNode",
            doneName = done++;

        return combinator.first ?
            function( elem, context, xml ) {
                while ( (elem = elem[ dir ]) ) {
                    if ( elem.nodeType === 1 || checkNonElements ) {
                        return matcher( elem, context, xml );
                    }
                }
            } :

            function( elem, context, xml ) {
                var oldCache, outerCache,
                    newCache = [ dirruns, doneName ];

                if ( xml ) {
                    while ( (elem = elem[ dir ]) ) {
                        if ( elem.nodeType === 1 || checkNonElements ) {
                            if ( matcher( elem, context, xml ) ) {
                                return true;
                            }
                        }
                    }
                } else {
                    while ( (elem = elem[ dir ]) ) {
                        if ( elem.nodeType === 1 || checkNonElements ) {
                            outerCache = elem[ expando ] || (elem[ expando ] = {});
                            if ( (oldCache = outerCache[ dir ]) &&
                                oldCache[ 0 ] === dirruns && oldCache[ 1 ] === doneName ) {

                                return (newCache[ 2 ] = oldCache[ 2 ]);
                            } else {
                                outerCache[ dir ] = newCache;

                                if ( (newCache[ 2 ] = matcher( elem, context, xml )) ) {
                                    return true;
                                }
                            }
                        }
                    }
                }
            };
    }

    function elementMatcher( matchers ) {
        return matchers.length > 1 ?
            function( elem, context, xml ) {
                var i = matchers.length;
                while ( i-- ) {
                    if ( !matchers[i]( elem, context, xml ) ) {
                        return false;
                    }
                }
                return true;
            } :
            matchers[0];
    }

    function multipleContexts( selector, contexts, results ) {
        var i = 0,
            len = contexts.length;
        for ( ; i < len; i++ ) {
            Sizzle( selector, contexts[i], results );
        }
        return results;
    }

    function condense( unmatched, map, filter, context, xml ) {
        var elem,
            newUnmatched = [],
            i = 0,
            len = unmatched.length,
            mapped = map != null;

        for ( ; i < len; i++ ) {
            if ( (elem = unmatched[i]) ) {
                if ( !filter || filter( elem, context, xml ) ) {
                    newUnmatched.push( elem );
                    if ( mapped ) {
                        map.push( i );
                    }
                }
            }
        }

        return newUnmatched;
    }

    function setMatcher( preFilter, selector, matcher, postFilter, postFinder, postSelector ) {
        if ( postFilter && !postFilter[ expando ] ) {
            postFilter = setMatcher( postFilter );
        }
        if ( postFinder && !postFinder[ expando ] ) {
            postFinder = setMatcher( postFinder, postSelector );
        }
        return markFunction(function( seed, results, context, xml ) {
            var temp, i, elem,
                preMap = [],
                postMap = [],
                preexisting = results.length,

                elems = seed || multipleContexts( selector || "*", context.nodeType ? [ context ] : context, [] ),

                matcherIn = preFilter && ( seed || !selector ) ?
                    condense( elems, preMap, preFilter, context, xml ) :
                    elems,

                matcherOut = matcher ?
                    postFinder || ( seed ? preFilter : preexisting || postFilter ) ?

                        [] :

                        results :
                    matcherIn;

            if ( matcher ) {
                matcher( matcherIn, matcherOut, context, xml );
            }

            if ( postFilter ) {
                temp = condense( matcherOut, postMap );
                postFilter( temp, [], context, xml );

                i = temp.length;
                while ( i-- ) {
                    if ( (elem = temp[i]) ) {
                        matcherOut[ postMap[i] ] = !(matcherIn[ postMap[i] ] = elem);
                    }
                }
            }

            if ( seed ) {
                if ( postFinder || preFilter ) {
                    if ( postFinder ) {
                        temp = [];
                        i = matcherOut.length;
                        while ( i-- ) {
                            if ( (elem = matcherOut[i]) ) {
                                temp.push( (matcherIn[i] = elem) );
                            }
                        }
                        postFinder( null, (matcherOut = []), temp, xml );
                    }

                    i = matcherOut.length;
                    while ( i-- ) {
                        if ( (elem = matcherOut[i]) &&
                            (temp = postFinder ? indexOf.call( seed, elem ) : preMap[i]) > -1 ) {

                            seed[temp] = !(results[temp] = elem);
                        }
                    }
                }

            } else {
                matcherOut = condense(
                    matcherOut === results ?
                        matcherOut.splice( preexisting, matcherOut.length ) :
                        matcherOut
                );
                if ( postFinder ) {
                    postFinder( null, results, matcherOut, xml );
                } else {
                    push.apply( results, matcherOut );
                }
            }
        });
    }

    function matcherFromTokens( tokens ) {
        var checkContext, matcher, j,
            len = tokens.length,
            leadingRelative = Expr.relative[ tokens[0].type ],
            implicitRelative = leadingRelative || Expr.relative[" "],
            i = leadingRelative ? 1 : 0,

            matchContext = addCombinator( function( elem ) {
                return elem === checkContext;
            }, implicitRelative, true ),
            matchAnyContext = addCombinator( function( elem ) {
                return indexOf.call( checkContext, elem ) > -1;
            }, implicitRelative, true ),
            matchers = [ function( elem, context, xml ) {
                return ( !leadingRelative && ( xml || context !== outermostContext ) ) || (
                        (checkContext = context).nodeType ?
                            matchContext( elem, context, xml ) :
                            matchAnyContext( elem, context, xml ) );
            } ];

        for ( ; i < len; i++ ) {
            if ( (matcher = Expr.relative[ tokens[i].type ]) ) {
                matchers = [ addCombinator(elementMatcher( matchers ), matcher) ];
            } else {
                matcher = Expr.filter[ tokens[i].type ].apply( null, tokens[i].matches );

                if ( matcher[ expando ] ) {
                    j = ++i;
                    for ( ; j < len; j++ ) {
                        if ( Expr.relative[ tokens[j].type ] ) {
                            break;
                        }
                    }
                    return setMatcher(
                        i > 1 && elementMatcher( matchers ),
                        i > 1 && toSelector(
                            tokens.slice( 0, i - 1 ).concat({ value: tokens[ i - 2 ].type === " " ? "*" : "" })
                        ).replace( rtrim, "$1" ),
                        matcher,
                        i < j && matcherFromTokens( tokens.slice( i, j ) ),
                        j < len && matcherFromTokens( (tokens = tokens.slice( j )) ),
                        j < len && toSelector( tokens )
                    );
                }
                matchers.push( matcher );
            }
        }

        return elementMatcher( matchers );
    }

    function matcherFromGroupMatchers( elementMatchers, setMatchers ) {
        var bySet = setMatchers.length > 0,
            byElement = elementMatchers.length > 0,
            superMatcher = function( seed, context, xml, results, outermost ) {
                var elem, j, matcher,
                    matchedCount = 0,
                    i = "0",
                    unmatched = seed && [],
                    setMatched = [],
                    contextBackup = outermostContext,
                    elems = seed || byElement && Expr.find["TAG"]( "*", outermost ),
                    dirrunsUnique = (dirruns += contextBackup == null ? 1 : Math.random() || 0.1),
                    len = elems.length;

                if ( outermost ) {
                    outermostContext = context !== document && context;
                }

                for ( ; i !== len && (elem = elems[i]) != null; i++ ) {
                    if ( byElement && elem ) {
                        j = 0;
                        while ( (matcher = elementMatchers[j++]) ) {
                            if ( matcher( elem, context, xml ) ) {
                                results.push( elem );
                                break;
                            }
                        }
                        if ( outermost ) {
                            dirruns = dirrunsUnique;
                        }
                    }

                    if ( bySet ) {
                        if ( (elem = !matcher && elem) ) {
                            matchedCount--;
                        }

                        if ( seed ) {
                            unmatched.push( elem );
                        }
                    }
                }

                matchedCount += i;
                if ( bySet && i !== matchedCount ) {
                    j = 0;
                    while ( (matcher = setMatchers[j++]) ) {
                        matcher( unmatched, setMatched, context, xml );
                    }

                    if ( seed ) {
                        if ( matchedCount > 0 ) {
                            while ( i-- ) {
                                if ( !(unmatched[i] || setMatched[i]) ) {
                                    setMatched[i] = pop.call( results );
                                }
                            }
                        }

                        setMatched = condense( setMatched );
                    }

                    push.apply( results, setMatched );

                    if ( outermost && !seed && setMatched.length > 0 &&
                        ( matchedCount + setMatchers.length ) > 1 ) {

                        Sizzle.uniqueSort( results );
                    }
                }

                if ( outermost ) {
                    dirruns = dirrunsUnique;
                    outermostContext = contextBackup;
                }

                return unmatched;
            };

        return bySet ?
            markFunction( superMatcher ) :
            superMatcher;
    }

    compile = Sizzle.compile = function( selector, match /* Internal Use Only */ ) {
        var i,
            setMatchers = [],
            elementMatchers = [],
            cached = compilerCache[ selector + " " ];

        if ( !cached ) {
            if ( !match ) {
                match = tokenize( selector );
            }
            i = match.length;
            while ( i-- ) {
                cached = matcherFromTokens( match[i] );
                if ( cached[ expando ] ) {
                    setMatchers.push( cached );
                } else {
                    elementMatchers.push( cached );
                }
            }

            cached = compilerCache( selector, matcherFromGroupMatchers( elementMatchers, setMatchers ) );

            cached.selector = selector;
        }
        return cached;
    };

    /**
     * A low-level selection function that works with Sizzle's compiled
     *  selector functions
     * @param {String|Function} selector A selector or a pre-compiled
     *  selector function built with Sizzle.compile
     * @param {Element} context
     * @param {Array} [results]
     * @param {Array} [seed] A set of elements to match against
     */
    select = Sizzle.select = function( selector, context, results, seed ) {
        var i, tokens, token, type, find,
            compiled = typeof selector === "function" && selector,
            match = !seed && tokenize( (selector = compiled.selector || selector) );

        results = results || [];

        if ( match.length === 1 ) {

            tokens = match[0] = match[0].slice( 0 );
            if ( tokens.length > 2 && (token = tokens[0]).type === "ID" &&
                support.getById && context.nodeType === 9 && documentIsHTML &&
                Expr.relative[ tokens[1].type ] ) {

                context = ( Expr.find["ID"]( token.matches[0].replace(runescape, funescape), context ) || [] )[0];
                if ( !context ) {
                    return results;

                } else if ( compiled ) {
                    context = context.parentNode;
                }

                selector = selector.slice( tokens.shift().value.length );
            }

            i = matchExpr["needsContext"].test( selector ) ? 0 : tokens.length;
            while ( i-- ) {
                token = tokens[i];

                if ( Expr.relative[ (type = token.type) ] ) {
                    break;
                }
                if ( (find = Expr.find[ type ]) ) {
                    if ( (seed = find(
                            token.matches[0].replace( runescape, funescape ),
                            rsibling.test( tokens[0].type ) && testContext( context.parentNode ) || context
                        )) ) {

                        tokens.splice( i, 1 );
                        selector = seed.length && toSelector( tokens );
                        if ( !selector ) {
                            push.apply( results, seed );
                            return results;
                        }

                        break;
                    }
                }
            }
        }

        ( compiled || compile( selector, match ) )(
            seed,
            context,
            !documentIsHTML,
            results,
            rsibling.test( selector ) && testContext( context.parentNode ) || context
        );
        return results;
    };


    support.sortStable = expando.split("").sort( sortOrder ).join("") === expando;

    support.detectDuplicates = !!hasDuplicate;

    setDocument();

    support.sortDetached = assert(function( div1 ) {
        return div1.compareDocumentPosition( document.createElement("div") ) & 1;
    });

    if ( !assert(function( div ) {
            div.innerHTML = "<a href='#'></a>";
            return div.firstChild.getAttribute("href") === "#" ;
        }) ) {
        addHandle( "type|href|height|width", function( elem, name, isXML ) {
            if ( !isXML ) {
                return elem.getAttribute( name, name.toLowerCase() === "type" ? 1 : 2 );
            }
        });
    }

    if ( !support.attributes || !assert(function( div ) {
            div.innerHTML = "<input/>";
            div.firstChild.setAttribute( "value", "" );
            return div.firstChild.getAttribute( "value" ) === "";
        }) ) {
        addHandle( "value", function( elem, name, isXML ) {
            if ( !isXML && elem.nodeName.toLowerCase() === "input" ) {
                return elem.defaultValue;
            }
        });
    }

    if ( !assert(function( div ) {
            return div.getAttribute("disabled") == null;
        }) ) {
        addHandle( booleans, function( elem, name, isXML ) {
            var val;
            if ( !isXML ) {
                return elem[ name ] === true ? name.toLowerCase() :
                    (val = elem.getAttributeNode( name )) && val.specified ?
                        val.value :
                        null;
            }
        });
    }

    if ( typeof define === "function" && define.amd ) {
        define(function() { return Sizzle; });
    } else if ( typeof module !== "undefined" && module.exports ) {
        module.exports = Sizzle;
    } else {
        window.Sizzle = Sizzle;
    }

})( window );

(function() {
    if (typeof Sizzle !== 'undefined') {
        return;
    }

    if (typeof define !== 'undefined' && define.amd) {
        window.Sizzle = Prototype._actual_sizzle;
        window.define = Prototype._original_define;
        delete Prototype._actual_sizzle;
        delete Prototype._original_define;
    } else if (typeof module !== 'undefined' && module.exports) {
        window.Sizzle = module.exports;
        module.exports = {};
    }
})();

(function(engine) {
    var extendElements = Prototype.Selector.extendElements;

    function select(selector, scope) {
        return extendElements(engine(selector, scope || document));
    }

    function match(element, selector) {
        return engine.matches(selector, [element]).length == 1;
    }

    Prototype.Selector.engine = engine;
    Prototype.Selector.select = select;
    Prototype.Selector.match = match;
})(Sizzle);

window.Sizzle = Prototype._original_property;
delete Prototype._original_property;

var Form = {
    reset: function(form) {
        form = $(form);
        form.reset();
        return form;
    },

    serializeElements: function(elements, options) {
        if (typeof options != 'object') options = { hash: !!options };
        else if (Object.isUndefined(options.hash)) options.hash = true;
        var key, value, submitted = false, submit = options.submit, accumulator, initial;

        if (options.hash) {
            initial = {};
            accumulator = function(result, key, value) {
                if (key in result) {
                    if (!Object.isArray(result[key])) result[key] = [result[key]];
                    result[key] = result[key].concat(value);
                } else result[key] = value;
                return result;
            };
        } else {
            initial = '';
            accumulator = function(result, key, values) {
                if (!Object.isArray(values)) {values = [values];}
                if (!values.length) {return result;}
                var encodedKey = encodeURIComponent(key).gsub(/%20/, '+');
                return result + (result ? "&" : "") + values.map(function (value) {
                        value = value.gsub(/(\r)?\n/, '\r\n');
                        value = encodeURIComponent(value);
                        value = value.gsub(/%20/, '+');
                        return encodedKey + "=" + value;
                    }).join("&");
            };
        }

        return elements.inject(initial, function(result, element) {
            if (!element.disabled && element.name) {
                key = element.name; value = $(element).getValue();
                if (value != null && element.type != 'file' && (element.type != 'submit' || (!submitted &&
                    submit !== false && (!submit || key == submit) && (submitted = true)))) {
                    result = accumulator(result, key, value);
                }
            }
            return result;
        });
    }
};

Form.Methods = {
    serialize: function(form, options) {
        return Form.serializeElements(Form.getElements(form), options);
    },


    getElements: function(form) {
        var elements = $(form).getElementsByTagName('*');
        var element, results = [], serializers = Form.Element.Serializers;

        for (var i = 0; element = elements[i]; i++) {
            if (serializers[element.tagName.toLowerCase()])
                results.push(Element.extend(element));
        }
        return results;
    },

    getInputs: function(form, typeName, name) {
        form = $(form);
        var inputs = form.getElementsByTagName('input');

        if (!typeName && !name) return $A(inputs).map(Element.extend);

        for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
            var input = inputs[i];
            if ((typeName && input.type != typeName) || (name && input.name != name))
                continue;
            matchingInputs.push(Element.extend(input));
        }

        return matchingInputs;
    },

    disable: function(form) {
        form = $(form);
        Form.getElements(form).invoke('disable');
        return form;
    },

    enable: function(form) {
        form = $(form);
        Form.getElements(form).invoke('enable');
        return form;
    },

    findFirstElement: function(form) {
        var elements = $(form).getElements().findAll(function(element) {
            return 'hidden' != element.type && !element.disabled;
        });
        var firstByIndex = elements.findAll(function(element) {
            return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
        }).sortBy(function(element) { return element.tabIndex }).first();

        return firstByIndex ? firstByIndex : elements.find(function(element) {
            return /^(?:input|select|textarea)$/i.test(element.tagName);
        });
    },

    focusFirstElement: function(form) {
        form = $(form);
        var element = form.findFirstElement();
        if (element) element.activate();
        return form;
    },

    request: function(form, options) {
        form = $(form), options = Object.clone(options || { });

        var params = options.parameters, action = form.readAttribute('action') || '';
        if (action.blank()) action = window.location.href;
        options.parameters = form.serialize(true);

        if (params) {
            if (Object.isString(params)) params = params.toQueryParams();
            Object.extend(options.parameters, params);
        }

        if (form.hasAttribute('method') && !options.method)
            options.method = form.method;

        return new Ajax.Request(action, options);
    }
};

/*--------------------------------------------------------------------------*/


Form.Element = {
    focus: function(element) {
        $(element).focus();
        return element;
    },

    select: function(element) {
        $(element).select();
        return element;
    }
};

Form.Element.Methods = {

    serialize: function(element) {
        element = $(element);
        if (!element.disabled && element.name) {
            var value = element.getValue();
            if (value != undefined) {
                var pair = { };
                pair[element.name] = value;
                return Object.toQueryString(pair);
            }
        }
        return '';
    },

    getValue: function(element) {
        element = $(element);
        var method = element.tagName.toLowerCase();
        return Form.Element.Serializers[method](element);
    },

    setValue: function(element, value) {
        element = $(element);
        var method = element.tagName.toLowerCase();
        Form.Element.Serializers[method](element, value);
        return element;
    },

    clear: function(element) {
        $(element).value = '';
        return element;
    },

    present: function(element) {
        return $(element).value != '';
    },

    activate: function(element) {
        element = $(element);
        try {
            element.focus();
            if (element.select && (element.tagName.toLowerCase() != 'input' ||
                !(/^(?:button|reset|submit)$/i.test(element.type))))
                element.select();
        } catch (e) { }
        return element;
    },

    disable: function(element) {
        element = $(element);
        element.disabled = true;
        return element;
    },

    enable: function(element) {
        element = $(element);
        element.disabled = false;
        return element;
    }
};

/*--------------------------------------------------------------------------*/

var Field = Form.Element;

var $F = Form.Element.Methods.getValue;

/*--------------------------------------------------------------------------*/

Form.Element.Serializers = (function() {
    function input(element, value) {
        switch (element.type.toLowerCase()) {
            case 'checkbox':
            case 'radio':
                return inputSelector(element, value);
            default:
                return valueSelector(element, value);
        }
    }

    function inputSelector(element, value) {
        if (Object.isUndefined(value))
            return element.checked ? element.value : null;
        else element.checked = !!value;
    }

    function valueSelector(element, value) {
        if (Object.isUndefined(value)) return element.value;
        else element.value = value;
    }

    function select(element, value) {
        if (Object.isUndefined(value))
            return (element.type === 'select-one' ? selectOne : selectMany)(element);

        var opt, currentValue, single = !Object.isArray(value);
        for (var i = 0, length = element.length; i < length; i++) {
            opt = element.options[i];
            currentValue = this.optionValue(opt);
            if (single) {
                if (currentValue == value) {
                    opt.selected = true;
                    return;
                }
            }
            else opt.selected = value.include(currentValue);
        }
    }

    function selectOne(element) {
        var index = element.selectedIndex;
        return index >= 0 ? optionValue(element.options[index]) : null;
    }

    function selectMany(element) {
        var values, length = element.length;
        if (!length) return null;

        for (var i = 0, values = []; i < length; i++) {
            var opt = element.options[i];
            if (opt.selected) values.push(optionValue(opt));
        }
        return values;
    }

    function optionValue(opt) {
        return Element.hasAttribute(opt, 'value') ? opt.value : opt.text;
    }

    return {
        input:         input,
        inputSelector: inputSelector,
        textarea:      valueSelector,
        select:        select,
        selectOne:     selectOne,
        selectMany:    selectMany,
        optionValue:   optionValue,
        button:        valueSelector
    };
})();

/*--------------------------------------------------------------------------*/


Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
    initialize: function($super, element, frequency, callback) {
        $super(callback, frequency);
        this.element   = $(element);
        this.lastValue = this.getValue();
    },

    execute: function() {
        var value = this.getValue();
        if (Object.isString(this.lastValue) && Object.isString(value) ?
            this.lastValue != value : String(this.lastValue) != String(value)) {
            this.callback(this.element, value);
            this.lastValue = value;
        }
    }
});

Form.Element.Observer = Class.create(Abstract.TimedObserver, {
    getValue: function() {
        return Form.Element.getValue(this.element);
    }
});

Form.Observer = Class.create(Abstract.TimedObserver, {
    getValue: function() {
        return Form.serialize(this.element);
    }
});

/*--------------------------------------------------------------------------*/

Abstract.EventObserver = Class.create({
    initialize: function(element, callback) {
        this.element  = $(element);
        this.callback = callback;

        this.lastValue = this.getValue();
        if (this.element.tagName.toLowerCase() == 'form')
            this.registerFormCallbacks();
        else
            this.registerCallback(this.element);
    },

    onElementEvent: function() {
        var value = this.getValue();
        if (this.lastValue != value) {
            this.callback(this.element, value);
            this.lastValue = value;
        }
    },

    registerFormCallbacks: function() {
        Form.getElements(this.element).each(this.registerCallback, this);
    },

    registerCallback: function(element) {
        if (element.type) {
            switch (element.type.toLowerCase()) {
                case 'checkbox':
                case 'radio':
                    Event.observe(element, 'click', this.onElementEvent.bind(this));
                    break;
                default:
                    Event.observe(element, 'change', this.onElementEvent.bind(this));
                    break;
            }
        }
    }
});

Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
    getValue: function() {
        return Form.Element.getValue(this.element);
    }
});

Form.EventObserver = Class.create(Abstract.EventObserver, {
    getValue: function() {
        return Form.serialize(this.element);
    }
});
(function(GLOBAL) {
    var DIV = document.createElement('div');
    var docEl = document.documentElement;
    var MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED = 'onmouseenter' in docEl
        && 'onmouseleave' in docEl;

    var Event = {
        KEY_BACKSPACE: 8,
        KEY_TAB:       9,
        KEY_RETURN:   13,
        KEY_ESC:      27,
        KEY_LEFT:     37,
        KEY_UP:       38,
        KEY_RIGHT:    39,
        KEY_DOWN:     40,
        KEY_DELETE:   46,
        KEY_HOME:     36,
        KEY_END:      35,
        KEY_PAGEUP:   33,
        KEY_PAGEDOWN: 34,
        KEY_INSERT:   45
    };


    var isIELegacyEvent = function(event) { return false; };

    if (window.attachEvent) {
        if (window.addEventListener) {
            isIELegacyEvent = function(event) {
                return !(event instanceof window.Event);
            };
        } else {
            isIELegacyEvent = function(event) { return true; };
        }
    }

    var _isButton;

    function _isButtonForDOMEvents(event, code) {
        return event.which ? (event.which === code + 1) : (event.button === code);
    }

    var legacyButtonMap = { 0: 1, 1: 4, 2: 2 };
    function _isButtonForLegacyEvents(event, code) {
        return event.button === legacyButtonMap[code];
    }

    function _isButtonForWebKit(event, code) {
        switch (code) {
            case 0: return event.which == 1 && !event.metaKey;
            case 1: return event.which == 2 || (event.which == 1 && event.metaKey);
            case 2: return event.which == 3;
            default: return false;
        }
    }

    if (window.attachEvent) {
        if (!window.addEventListener) {
            _isButton = _isButtonForLegacyEvents;
        } else {
            _isButton = function(event, code) {
                return isIELegacyEvent(event) ? _isButtonForLegacyEvents(event, code) :
                    _isButtonForDOMEvents(event, code);
            }
        }
    } else if (Prototype.Browser.WebKit) {
        _isButton = _isButtonForWebKit;
    } else {
        _isButton = _isButtonForDOMEvents;
    }

    function isLeftClick(event)   { return _isButton(event, 0) }

    function isMiddleClick(event) { return _isButton(event, 1) }

    function isRightClick(event)  { return _isButton(event, 2) }

    function element(event) {
        return Element.extend(_element(event));
    }

    function _element(event) {
        event = Event.extend(event);

        var node = event.target, type = event.type,
            currentTarget = event.currentTarget;

        if (currentTarget && currentTarget.tagName) {
            if (type === 'load' || type === 'error' ||
                (type === 'click' && currentTarget.tagName.toLowerCase() === 'input'
                && currentTarget.type === 'radio'))
                node = currentTarget;
        }

        return node.nodeType == Node.TEXT_NODE ? node.parentNode : node;
    }

    function findElement(event, expression) {
        var element = _element(event), selector = Prototype.Selector;
        if (!expression) return Element.extend(element);
        while (element) {
            if (Object.isElement(element) && selector.match(element, expression))
                return Element.extend(element);
            element = element.parentNode;
        }
    }

    function pointer(event) {
        return { x: pointerX(event), y: pointerY(event) };
    }

    function pointerX(event) {
        var docElement = document.documentElement,
            body = document.body || { scrollLeft: 0 };

        return event.pageX || (event.clientX +
            (docElement.scrollLeft || body.scrollLeft) -
            (docElement.clientLeft || 0));
    }

    function pointerY(event) {
        var docElement = document.documentElement,
            body = document.body || { scrollTop: 0 };

        return  event.pageY || (event.clientY +
            (docElement.scrollTop || body.scrollTop) -
            (docElement.clientTop || 0));
    }


    function stop(event) {
        Event.extend(event);
        event.preventDefault();
        event.stopPropagation();

        event.stopped = true;
    }


    Event.Methods = {
        isLeftClick:   isLeftClick,
        isMiddleClick: isMiddleClick,
        isRightClick:  isRightClick,

        element:     element,
        findElement: findElement,

        pointer:  pointer,
        pointerX: pointerX,
        pointerY: pointerY,

        stop: stop
    };

    var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
        m[name] = Event.Methods[name].methodize();
        return m;
    });

    if (window.attachEvent) {
        function _relatedTarget(event) {
            var element;
            switch (event.type) {
                case 'mouseover':
                case 'mouseenter':
                    element = event.fromElement;
                    break;
                case 'mouseout':
                case 'mouseleave':
                    element = event.toElement;
                    break;
                default:
                    return null;
            }
            return Element.extend(element);
        }

        var additionalMethods = {
            stopPropagation: function() { this.cancelBubble = true },
            preventDefault:  function() { this.returnValue = false },
            inspect: function() { return '[object Event]' }
        };

        Event.extend = function(event, element) {
            if (!event) return false;

            if (!isIELegacyEvent(event)) return event;

            if (event._extendedByPrototype) return event;
            event._extendedByPrototype = Prototype.emptyFunction;

            var pointer = Event.pointer(event);

            Object.extend(event, {
                target: event.srcElement || element,
                relatedTarget: _relatedTarget(event),
                pageX:  pointer.x,
                pageY:  pointer.y
            });

            Object.extend(event, methods);
            Object.extend(event, additionalMethods);

            return event;
        };
    } else {
        Event.extend = Prototype.K;
    }

    if (window.addEventListener) {
        Event.prototype = window.Event.prototype || document.createEvent('HTMLEvents').__proto__;
        Object.extend(Event.prototype, methods);
    }

    var EVENT_TRANSLATIONS = {
        mouseenter: 'mouseover',
        mouseleave: 'mouseout'
    };

    function getDOMEventName(eventName) {
        return EVENT_TRANSLATIONS[eventName] || eventName;
    }

    if (MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED)
        getDOMEventName = Prototype.K;

    function getUniqueElementID(element) {
        if (element === window) return 0;

        if (typeof element._prototypeUID === 'undefined')
            element._prototypeUID = Element.Storage.UID++;
        return element._prototypeUID;
    }

    function getUniqueElementID_IE(element) {
        if (element === window) return 0;
        if (element == document) return 1;
        return element.uniqueID;
    }

    if ('uniqueID' in DIV)
        getUniqueElementID = getUniqueElementID_IE;

    function isCustomEvent(eventName) {
        return eventName.include(':');
    }

    Event._isCustomEvent = isCustomEvent;

    function getOrCreateRegistryFor(element, uid) {
        var CACHE = GLOBAL.Event.cache;
        if (Object.isUndefined(uid))
            uid = getUniqueElementID(element);
        if (!CACHE[uid]) CACHE[uid] = { element: element };
        return CACHE[uid];
    }

    function destroyRegistryForElement(element, uid) {
        if (Object.isUndefined(uid))
            uid = getUniqueElementID(element);
        delete GLOBAL.Event.cache[uid];
    }


    function register(element, eventName, handler) {
        var registry = getOrCreateRegistryFor(element);
        if (!registry[eventName]) registry[eventName] = [];
        var entries = registry[eventName];

        var i = entries.length;
        while (i--)
            if (entries[i].handler === handler) return null;

        var uid = getUniqueElementID(element);
        var responder = GLOBAL.Event._createResponder(uid, eventName, handler);
        var entry = {
            responder: responder,
            handler:   handler
        };

        entries.push(entry);
        return entry;
    }

    function unregister(element, eventName, handler) {
        var registry = getOrCreateRegistryFor(element);
        var entries = registry[eventName] || [];

        var i = entries.length, entry;
        while (i--) {
            if (entries[i].handler === handler) {
                entry = entries[i];
                break;
            }
        }

        if (entry) {
            var index = entries.indexOf(entry);
            entries.splice(index, 1);
        }

        if (entries.length === 0) {
            delete registry[eventName];
            if (Object.keys(registry).length === 1 && ('element' in registry))
                destroyRegistryForElement(element);
        }

        return entry;
    }


    function observe(element, eventName, handler) {
        element = $(element);
        var entry = register(element, eventName, handler);

        if (entry === null) return element;

        var responder = entry.responder;
        if (isCustomEvent(eventName))
            observeCustomEvent(element, eventName, responder);
        else
            observeStandardEvent(element, eventName, responder);

        return element;
    }

    function observeStandardEvent(element, eventName, responder) {
        var actualEventName = getDOMEventName(eventName);
        if (element.addEventListener) {
            element.addEventListener(actualEventName, responder, false);
        } else {
            element.attachEvent('on' + actualEventName, responder);
        }
    }

    function observeCustomEvent(element, eventName, responder) {
        if (element.addEventListener) {
            element.addEventListener('dataavailable', responder, false);
        } else {
            element.attachEvent('ondataavailable', responder);
            element.attachEvent('onlosecapture',   responder);
        }
    }

    function stopObserving(element, eventName, handler) {
        element = $(element);
        var handlerGiven = !Object.isUndefined(handler),
            eventNameGiven = !Object.isUndefined(eventName);

        if (!eventNameGiven && !handlerGiven) {
            stopObservingElement(element);
            return element;
        }

        if (!handlerGiven) {
            stopObservingEventName(element, eventName);
            return element;
        }

        var entry = unregister(element, eventName, handler);

        if (!entry) return element;
        removeEvent(element, eventName, entry.responder);
        return element;
    }

    function stopObservingStandardEvent(element, eventName, responder) {
        var actualEventName = getDOMEventName(eventName);
        if (element.removeEventListener) {
            element.removeEventListener(actualEventName, responder, false);
        } else {
            element.detachEvent('on' + actualEventName, responder);
        }
    }

    function stopObservingCustomEvent(element, eventName, responder) {
        if (element.removeEventListener) {
            element.removeEventListener('dataavailable', responder, false);
        } else {
            element.detachEvent('ondataavailable', responder);
            element.detachEvent('onlosecapture',   responder);
        }
    }



    function stopObservingElement(element) {
        var uid = getUniqueElementID(element), registry = GLOBAL.Event.cache[uid];
        if (!registry) return;

        destroyRegistryForElement(element, uid);

        var entries, i;
        for (var eventName in registry) {
            if (eventName === 'element') continue;

            entries = registry[eventName];
            i = entries.length;
            while (i--)
                removeEvent(element, eventName, entries[i].responder);
        }
    }

    function stopObservingEventName(element, eventName) {
        var registry = getOrCreateRegistryFor(element);
        var entries = registry[eventName];
        if (entries) {
            delete registry[eventName];
        }

        entries = entries || [];

        var i = entries.length;
        while (i--)
            removeEvent(element, eventName, entries[i].responder);

        for (var name in registry) {
            if (name === 'element') continue;
            return; // There is another registered event
        }

        destroyRegistryForElement(element);
    }


    function removeEvent(element, eventName, handler) {
        if (isCustomEvent(eventName))
            stopObservingCustomEvent(element, eventName, handler);
        else
            stopObservingStandardEvent(element, eventName, handler);
    }



    function getFireTarget(element) {
        if (element !== document) return element;
        if (document.createEvent && !element.dispatchEvent)
            return document.documentElement;
        return element;
    }

    function fire(element, eventName, memo, bubble) {
        element = getFireTarget($(element));
        if (Object.isUndefined(bubble)) bubble = true;
        memo = memo || {};

        var event = fireEvent(element, eventName, memo, bubble);
        return Event.extend(event);
    }

    function fireEvent_DOM(element, eventName, memo, bubble) {
        var event = document.createEvent('HTMLEvents');
        event.initEvent('dataavailable', bubble, true);

        event.eventName = eventName;
        event.memo = memo;

        element.dispatchEvent(event);
        return event;
    }

    function fireEvent_IE(element, eventName, memo, bubble) {
        var event = document.createEventObject();
        event.eventType = bubble ? 'ondataavailable' : 'onlosecapture';

        event.eventName = eventName;
        event.memo = memo;

        try{
            element.fireEvent(event.eventType, event);
        }catch(unspec){}

        return event;
    }

    var fireEvent = document.createEvent ? fireEvent_DOM : fireEvent_IE;



    Event.Handler = Class.create({
        initialize: function(element, eventName, selector, callback) {
            this.element   = $(element);
            this.eventName = eventName;
            this.selector  = selector;
            this.callback  = callback;
            this.handler   = this.handleEvent.bind(this);
        },


        start: function() {
            Event.observe(this.element, this.eventName, this.handler);
            return this;
        },

        stop: function() {
            Event.stopObserving(this.element, this.eventName, this.handler);
            return this;
        },

        handleEvent: function(event) {
            var element = Event.findElement(event, this.selector);
            if (element) this.callback.call(this.element, event, element);
        }
    });

    function on(element, eventName, selector, callback) {
        element = $(element);
        if (Object.isFunction(selector) && Object.isUndefined(callback)) {
            callback = selector, selector = null;
        }

        return new Event.Handler(element, eventName, selector, callback).start();
    }

    Object.extend(Event, Event.Methods);

    Object.extend(Event, {
        fire:          fire,
        observe:       observe,
        stopObserving: stopObserving,
        on:            on
    });

    Element.addMethods({
        fire:          fire,

        observe:       observe,

        stopObserving: stopObserving,

        on:            on
    });

    Object.extend(document, {
        fire:          fire.methodize(),

        observe:       observe.methodize(),

        stopObserving: stopObserving.methodize(),

        on:            on.methodize(),

        loaded:        false
    });

    if (GLOBAL.Event) Object.extend(window.Event, Event);
    else GLOBAL.Event = Event;

    GLOBAL.Event.cache = {};

    function destroyCache_IE() {
        GLOBAL.Event.cache = null;
    }

    if (window.attachEvent)
        window.attachEvent('onunload', destroyCache_IE);

    DIV = null;
    docEl = null;
})(this);

(function(GLOBAL) {
    /* Code for creating leak-free event responders is based on work by
     John-David Dalton. */

    var docEl = document.documentElement;
    var MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED = 'onmouseenter' in docEl
        && 'onmouseleave' in docEl;

    function isSimulatedMouseEnterLeaveEvent(eventName) {
        return !MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED &&
            (eventName === 'mouseenter' || eventName === 'mouseleave');
    }

    function createResponder(uid, eventName, handler) {
        if (Event._isCustomEvent(eventName))
            return createResponderForCustomEvent(uid, eventName, handler);
        if (isSimulatedMouseEnterLeaveEvent(eventName))
            return createMouseEnterLeaveResponder(uid, eventName, handler);

        return function(event) {
            if (!Event.cache) return;

            var element = Event.cache[uid].element;
            Event.extend(event, element);
            handler.call(element, event);
        };
    }

    function createResponderForCustomEvent(uid, eventName, handler) {
        return function(event) {
            var cache = Event.cache[uid];
            var element =  cache && cache.element;

            if (Object.isUndefined(event.eventName))
                return false;

            if (event.eventName !== eventName)
                return false;

            Event.extend(event, element);
            handler.call(element, event);
        };
    }

    function createMouseEnterLeaveResponder(uid, eventName, handler) {
        return function(event) {
            var element = Event.cache[uid].element;

            Event.extend(event, element);
            var parent = event.relatedTarget;

            while (parent && parent !== element) {
                try { parent = parent.parentNode; }
                catch(e) { parent = element; }
            }

            if (parent === element) return;
            handler.call(element, event);
        }
    }

    GLOBAL.Event._createResponder = createResponder;
    docEl = null;
})(this);

(function(GLOBAL) {
    /* Support for the DOMContentLoaded event is based on work by Dan Webb,
     Matthias Miller, Dean Edwards, John Resig, and Diego Perini. */

    var TIMER;

    function fireContentLoadedEvent() {
        if (document.loaded) return;
        if (TIMER) window.clearTimeout(TIMER);
        document.loaded = true;
        document.fire('dom:loaded');
    }

    function checkReadyState() {
        if (document.readyState === 'complete') {
            document.detachEvent('onreadystatechange', checkReadyState);
            fireContentLoadedEvent();
        }
    }

    function pollDoScroll() {
        try {
            document.documentElement.doScroll('left');
        } catch (e) {
            TIMER = pollDoScroll.defer();
            return;
        }

        fireContentLoadedEvent();
    }


    if (document.readyState === 'complete') {
        fireContentLoadedEvent();
        return;
    }

    if (document.addEventListener) {
        document.addEventListener('DOMContentLoaded', fireContentLoadedEvent, false);
    } else {
        document.attachEvent('onreadystatechange', checkReadyState);
        if (window == top) TIMER = pollDoScroll.defer();
    }

    Event.observe(window, 'load', fireContentLoadedEvent);
})(this);


Element.addMethods();
/*------------------------------- DEPRECATED -------------------------------*/

Hash.toQueryString = Object.toQueryString;

var Toggle = { display: Element.toggle };

Element.addMethods({
    childOf: Element.Methods.descendantOf
});

var Insertion = {
    Before: function(element, content) {
        return Element.insert(element, {before:content});
    },

    Top: function(element, content) {
        return Element.insert(element, {top:content});
    },

    Bottom: function(element, content) {
        return Element.insert(element, {bottom:content});
    },

    After: function(element, content) {
        return Element.insert(element, {after:content});
    }
};

var $continue = new Error('"throw $continue" is deprecated, use "return" instead');

var Position = {
    includeScrollOffsets: false,

    prepare: function() {
        this.deltaX =  window.pageXOffset
            || document.documentElement.scrollLeft
            || document.body.scrollLeft
            || 0;
        this.deltaY =  window.pageYOffset
            || document.documentElement.scrollTop
            || document.body.scrollTop
            || 0;
    },

    within: function(element, x, y) {
        if (this.includeScrollOffsets)
            return this.withinIncludingScrolloffsets(element, x, y);
        this.xcomp = x;
        this.ycomp = y;
        this.offset = Element.cumulativeOffset(element);

        return (y >= this.offset[1] &&
        y <  this.offset[1] + element.offsetHeight &&
        x >= this.offset[0] &&
        x <  this.offset[0] + element.offsetWidth);
    },

    withinIncludingScrolloffsets: function(element, x, y) {
        var offsetcache = Element.cumulativeScrollOffset(element);

        this.xcomp = x + offsetcache[0] - this.deltaX;
        this.ycomp = y + offsetcache[1] - this.deltaY;
        this.offset = Element.cumulativeOffset(element);

        return (this.ycomp >= this.offset[1] &&
        this.ycomp <  this.offset[1] + element.offsetHeight &&
        this.xcomp >= this.offset[0] &&
        this.xcomp <  this.offset[0] + element.offsetWidth);
    },

    overlap: function(mode, element) {
        if (!mode) return 0;
        if (mode == 'vertical')
            return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
                element.offsetHeight;
        if (mode == 'horizontal')
            return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
                element.offsetWidth;
    },


    cumulativeOffset: Element.Methods.cumulativeOffset,

    positionedOffset: Element.Methods.positionedOffset,

    absolutize: function(element) {
        Position.prepare();
        return Element.absolutize(element);
    },

    relativize: function(element) {
        Position.prepare();
        return Element.relativize(element);
    },

    realOffset: Element.Methods.cumulativeScrollOffset,

    offsetParent: Element.Methods.getOffsetParent,

    page: Element.Methods.viewportOffset,

    clone: function(source, target, options) {
        options = options || { };
        return Element.clonePosition(target, source, options);
    }
};

/*--------------------------------------------------------------------------*/

if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
    function iter(name) {
        return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
    }

    instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
        function(element, className) {
            className = className.toString().strip();
            var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
            return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
        } : function(element, className) {
        className = className.toString().strip();
        var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
        if (!classNames && !className) return elements;

        var nodes = $(element).getElementsByTagName('*');
        className = ' ' + className + ' ';

        for (var i = 0, child, cn; child = nodes[i]; i++) {
            if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
                (classNames && classNames.all(function(name) {
                    return !name.toString().blank() && cn.include(' ' + name + ' ');
                }))))
                elements.push(Element.extend(child));
        }
        return elements;
    };

    return function(className, parentElement) {
        return $(parentElement || document.body).getElementsByClassName(className);
    };
}(Element.Methods);

/*--------------------------------------------------------------------------*/

Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
    initialize: function(element) {
        this.element = $(element);
    },

    _each: function(iterator, context) {
        this.element.className.split(/\s+/).select(function(name) {
            return name.length > 0;
        })._each(iterator, context);
    },

    set: function(className) {
        this.element.className = className;
    },

    add: function(classNameToAdd) {
        if (this.include(classNameToAdd)) return;
        this.set($A(this).concat(classNameToAdd).join(' '));
    },

    remove: function(classNameToRemove) {
        if (!this.include(classNameToRemove)) return;
        this.set($A(this).without(classNameToRemove).join(' '));
    },

    toString: function() {
        return $A(this).join(' ');
    }
};

Object.extend(Element.ClassNames.prototype, Enumerable);

/*--------------------------------------------------------------------------*/

(function() {
    window.Selector = Class.create({
        initialize: function(expression) {
            this.expression = expression.strip();
        },

        findElements: function(rootElement) {
            return Prototype.Selector.select(this.expression, rootElement);
        },

        match: function(element) {
            return Prototype.Selector.match(element, this.expression);
        },

        toString: function() {
            return this.expression;
        },

        inspect: function() {
            return "#<Selector: " + this.expression + ">";
        }
    });

    Object.extend(Selector, {
        matchElements: function(elements, expression) {
            var match = Prototype.Selector.match,
                results = [];

            for (var i = 0, length = elements.length; i < length; i++) {
                var element = elements[i];
                if (match(element, expression)) {
                    results.push(Element.extend(element));
                }
            }
            return results;
        },

        findElement: function(elements, expression, index) {
            index = index || 0;
            var matchIndex = 0, element;
            for (var i = 0, length = elements.length; i < length; i++) {
                element = elements[i];
                if (Prototype.Selector.match(element, expression) && index === matchIndex++) {
                    return Element.extend(element);
                }
            }
        },

        findChildElements: function(element, expressions) {
            var selector = expressions.toArray().join(', ');
            return Prototype.Selector.select(selector, element || document);
        }
    });
})();