/*  Prototype JavaScript framework, version 1.6.0
	*  (c) 2005-2007 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: '1.6.0',

		Browser: {
				IE:     !!(window.attachEvent && !window.opera),
				Opera:  !!window.opera,
				WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
				Gecko:  navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1,
				MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
		},

		BrowserFeatures: {
				XPath: !!document.evaluate,
				ElementExtensions: !!window.HTMLElement,
				SpecificElementExtensions:
						document.createElement('div').__proto__ &&
						document.createElement('div').__proto__ !==
								document.createElement('form').__proto__
		},

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

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

if (Prototype.Browser.MobileSafari)
		Prototype.BrowserFeatures.SpecificElementExtensions = false;

if (Prototype.Browser.WebKit)
		Prototype.BrowserFeatures.XPath = false;

/* Based on Alex Arnell's inheritance implementation. */
var Class = {
		create: function() {
				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) {
						var subclass = function() { };
						subclass.prototype = parent.prototype;
						klass.prototype = new subclass;
						parent.subclasses.push(klass);
				}

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

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

				klass.prototype.constructor = klass;

				return klass;
		}
};

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

				if (!Object.keys({ toString: true }).length)
						properties.push("toString", "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().first() == "$super") {
								var method = value, value = Object.extend((function(m) {
										return function() { return ancestor[m].apply(this, arguments) };
								})(property).wrap(method), {
										valueOf:  function() { return method },
										toString: function() { return method.toString() }
								});
						}
						this.prototype[property] = value;
				}

				return this;
		}
};

var Abstract = { };

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

Object.extend(Object, {
		inspect: function(object) {
				try {
						if (object === undefined) return 'undefined';
						if (object === null) return 'null';
						return object.inspect ? object.inspect() : object.toString();
				} catch (e) {
						if (e instanceof RangeError) return '...';
						throw e;
				}
		},

		toJSON: function(object) {
				var type = typeof object;
				switch (type) {
						case 'undefined':
						case 'function':
						case 'unknown': return;
						case 'boolean': return object.toString();
				}

				if (object === null) return 'null';
				if (object.toJSON) return object.toJSON();
				if (Object.isElement(object)) return;

				var results = [];
				for (var property in object) {
						var value = Object.toJSON(object[property]);
						if (value !== undefined)
								results.push(property.toJSON() + ': ' + value);
				}

				return '{' + results.join(', ') + '}';
		},

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

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

		keys: function(object) {
				var keys = [];
				for (var property in object)
						keys.push(property);
				return keys;
		},

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

		clone: function(object) {
				return Object.extend({ }, object);
		},

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

		isArray: function(object) {
				return object && object.constructor === Array;
		},

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

		isFunction: function(object) {
				return typeof object == "function";
		},

		isString: function(object) {
				return typeof object == "string";
		},

		isNumber: function(object) {
				return typeof object == "number";
		},

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

Object.extend(Function.prototype, {
		argumentNames: function() {
				var names = this.toString().match(/^[\s\(]*function[^(]*\((.*?)\)/)[1].split(",").invoke("strip");
				return names.length == 1 && !names[0] ? [] : names;
		},

		bind: function() {
				if (arguments.length < 2 && arguments[0] === undefined) return this;
				var __method = this, args = $A(arguments), object = args.shift();
				return function() {
						return __method.apply(object, args.concat($A(arguments)));
				}
		},

		bindAsEventListener: function() {
				var __method = this, args = $A(arguments), object = args.shift();
				return function(event) {
						return __method.apply(object, [event || window.event].concat(args));
				}
		},

		curry: function() {
				if (!arguments.length) return this;
				var __method = this, args = $A(arguments);
				return function() {
						return __method.apply(this, args.concat($A(arguments)));
				}
		},

		delay: function() {
				var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
				return window.setTimeout(function() {
						return __method.apply(__method, args);
				}, timeout);
		},

		wrap: function(wrapper) {
				var __method = this;
				return function() {
						return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
				}
		},

		methodize: function() {
				if (this._methodized) return this._methodized;
				var __method = this;
				return this._methodized = function() {
						return __method.apply(null, [this].concat($A(arguments)));
				};
		}
});

Function.prototype.defer = Function.prototype.delay.curry(0.01);

Date.prototype.toJSON = function() {
		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"';
};

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;
		}
};

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();
						} finally {
								this.currentlyExecuting = false;
						}
				}
		}
});
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, {
		gsub: function(pattern, replacement) {
				var result = '', source = this, match;
				replacement = arguments.callee.prepareReplacement(replacement);

				while (source.length > 0) {
						if (match = source.match(pattern)) {
								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;
		},

		sub: function(pattern, replacement, count) {
				replacement = this.gsub.prepareReplacement(replacement);
				count = count === undefined ? 1 : count;

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

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

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

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

		stripTags: function() {
				return this.replace(/<\/?[^>]+>/gi, '');
		},

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

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

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

		escapeHTML: function() {
				var self = arguments.callee;
				self.text.data = this;
				return self.div.innerHTML;
		},

		unescapeHTML: function() {
				var div = new Element('div');
				div.innerHTML = this.stripTags();
				return div.childNodes[0] ? (div.childNodes.length > 1 ?
						$A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
						div.childNodes[0].nodeValue) : '';
		},

		toQueryParams: function(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());
								var value = pair.length > 1 ? pair.join('=') : pair[0];
								if (value != undefined) 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;
				});
		},

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

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

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

		camelize: function() {
				var parts = this.split('-'), len = parts.length;
				if (len == 1) return parts[0];

				var camelized = this.charAt(0) == '-'
						? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
						: parts[0];

				for (var i = 1; i < len; i++)
						camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);

				return camelized;
		},

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

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

		dasherize: function() {
				return this.gsub(/_/,'-');
		},

		inspect: function(useDoubleQuotes) {
				var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
						var character = String.specialChar[match[0]];
						return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
				});
				if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
				return "'" + escapedString.replace(/'/g, '\\\'') + "'";
		},

		toJSON: function() {
				return this.inspect(true);
		},

		unfilterJSON: function(filter) {
				return this.sub(filter || Prototype.JSONFilter, '#{1}');
		},

		isJSON: function() {
				var str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
				return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
		},

		evalJSON: function(sanitize) {
				var json = this.unfilterJSON();
				try {
						if (!sanitize || json.isJSON()) return eval('(' + json + ')');
				} catch (e) { }
				throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
		},

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

		startsWith: function(pattern) {
				return this.indexOf(pattern) === 0;
		},

		endsWith: function(pattern) {
				var d = this.length - pattern.length;
				return d >= 0 && this.lastIndexOf(pattern) === d;
		},

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

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

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

if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
		escapeHTML: function() {
				return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
		},
		unescapeHTML: function() {
				return this.replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
		}
});

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

String.prototype.parseQuery = String.prototype.toQueryParams;

Object.extend(String.prototype.escapeHTML, {
		div:  document.createElement('div'),
		text: document.createTextNode('')
});

with (String.prototype.escapeHTML) div.appendChild(text);

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

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

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

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

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

						while (match != null) {
								var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : 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);
				}.bind(this));
		}
});
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;

var $break = { };

var Enumerable = {
		each: function(iterator, context) {
				var index = 0;
				iterator = iterator.bind(context);
				try {
						this._each(function(value) {
								iterator(value, index++);
						});
				} catch (e) {
						if (e != $break) throw e;
				}
				return this;
		},

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

		zip: function() {
				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));
				});
		},

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

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

Object.extend(Enumerable, {
		map:     Enumerable.collect,
		find:    Enumerable.detect,
		select:  Enumerable.findAll,
		filter:  Enumerable.findAll,
		member:  Enumerable.include,
		entries: Enumerable.toArray,
		every:   Enumerable.all,
		some:    Enumerable.any
});
function $A(iterable) {
		if (!iterable) return [];
		if (iterable.toArray) return iterable.toArray();
		var length = iterable.length, results = new Array(length);
		while (length--) results[length] = iterable[length];
		return results;
}

if (Prototype.Browser.WebKit) {
		function $A(iterable) {
				if (!iterable) return [];
				if (!(Object.isFunction(iterable) && iterable == '[object NodeList]') &&
								iterable.toArray) return iterable.toArray();
				var length = iterable.length, results = new Array(length);
				while (length--) results[length] = iterable[length];
				return results;
		}
}

Array.from = $A;

Object.extend(Array.prototype, Enumerable);

if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
		_each: function(iterator) {
				for (var i = 0, length = this.length; i < length; i++)
						iterator(this[i]);
		},

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

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

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

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

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

		without: function() {
				var values = $A(arguments);
				return this.select(function(value) {
						return !values.include(value);
				});
		},

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

		reduce: function() {
				return this.length > 1 ? this : this[0];
		},

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

		intersect: function(array) {
				return this.uniq().findAll(function(item) {
						return array.detect(function(value) { return item === value });
				});
		},

		clone: function() {
				return [].concat(this);
		},

		size: function() {
				return this.length;
		},

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

		toJSON: function() {
				var results = [];
				this.each(function(object) {
						var value = Object.toJSON(object);
						if (value !== undefined) results.push(value);
				});
				return '[' + results.join(', ') + ']';
		}
});

// use native browser JS 1.6 implementation if available
if (Object.isFunction(Array.prototype.forEach))
		Array.prototype._each = Array.prototype.forEach;

if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
		i || (i = 0);
		var length = this.length;
		if (i < 0) i = length + i;
		for (; i < length; i++)
				if (this[i] === item) return i;
		return -1;
};

if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
		i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
		var n = this.slice(0, i).reverse().indexOf(item);
		return (n < 0) ? n : i - n - 1;
};

Array.prototype.toArray = Array.prototype.clone;

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

if (Prototype.Browser.Opera){
		Array.prototype.concat = function() {
				var array = [];
				for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
				for (var i = 0, length = arguments.length; i < length; i++) {
						if (Object.isArray(arguments[i])) {
								for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
										array.push(arguments[i][j]);
						} else {
								array.push(arguments[i]);
						}
				}
				return array;
		};
}
Object.extend(Number.prototype, {
		toColorPart: function() {
				return this.toPaddedString(2, 16);
		},

		succ: function() {
				return this + 1;
		},

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

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

		toJSON: function() {
				return isFinite(this) ? this.toString() : 'null';
		}
});

$w('abs round ceil floor').each(function(method){
		Number.prototype[method] = Math[method].methodize();
});
function $H(object) {
		return new Hash(object);
};

var Hash = Class.create(Enumerable, (function() {
		if (function() {
				var i = 0, Test = function(value) { this.key = value };
				Test.prototype.key = 'foo';
				for (var property in new Test('bar')) i++;
				return i > 1;
		}()) {
				function each(iterator) {
						var cache = [];
						for (var key in this._object) {
								var value = this._object[key];
								if (cache.include(key)) continue;
								cache.push(key);
								var pair = [key, value];
								pair.key = key;
								pair.value = value;
								iterator(pair);
						}
				}
		} else {
				function each(iterator) {
						for (var key in this._object) {
								var value = this._object[key], pair = [key, value];
								pair.key = key;
								pair.value = value;
								iterator(pair);
						}
				}
		}

		function toQueryPair(key, value) {
				if (Object.isUndefined(value)) return key;
				return key + '=' + encodeURIComponent(String.interpret(value));
		}

		return {
				initialize: function(object) {
						this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
				},

				_each: each,

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

				get: function(key) {
						return this._object[key];
				},

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

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

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

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

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

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

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

				toQueryString: function() {
						return this.map(function(pair) {
								var key = encodeURIComponent(pair.key), values = pair.value;

								if (values && typeof values == 'object') {
										if (Object.isArray(values))
												return values.map(toQueryPair.curry(key)).join('&');
								}
								return toQueryPair(key, values);
						}).join('&');
				},

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

				toJSON: function() {
						return Object.toJSON(this.toObject());
				},

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

Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
Hash.from = $H;
var ObjectRange = Class.create(Enumerable, {
		initialize: function(start, end, exclusive) {
				this.start = start;
				this.end = end;
				this.exclusive = exclusive;
		},

		_each: function(iterator) {
				var value = this.start;
				while (this.include(value)) {
						iterator(value);
						value = value.succ();
				}
		},

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

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

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) {
				this.responders._each(iterator);
		},

		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.isString(this.options.parameters))
						this.options.parameters = this.options.parameters.toQueryParams();
		}
});

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.clone(this.options.parameters);

				if (!['get', 'post'].include(this.method)) {
						// simulate other verbs over post
						params['_method'] = this.method;
						this.method = 'post';
				}

				this.parameters = params;

				if (params = Object.toQueryString(params)) {
						// when GET, append parameters to URL
						if (this.method == 'get')
								this.url += (this.url.include('?') ? '&' : '?') + params;
						else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
								params += '&_=';
				}

				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);

						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';
				}

				// user-defined headers
				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)
						this.transport.setRequestHeader(name, headers[name]);
		},

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

		getStatus: function() {
				try {
						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 && 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') {
						// avoid memory leak in MSIE: clean up
						this.transport.onreadystatechange = Prototype.emptyFunction;
				}
		},

		getHeader: function(name) {
				try {
						return this.transport.getResponseHeader(name);
				} 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  = xml === undefined ? 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;
				json = decodeURIComponent(escape(json));
				try {
						return json.evalJSON(this.request.options.sanitizeJSON);
				} 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')))
								return null;
				try {
						return this.transport.responseText.evalJSON(options.sanitizeJSON);
				} 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 = options || { };
				var onComplete = options.onComplete;
				options.onComplete = (function(response, param) {
						this.updateContent(response.responseText);
						if (Object.isFunction(onComplete)) onComplete(response, param);
				}).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);
				}

				if (this.success()) {
						if (this.onComplete) this.onComplete.bind(this).defer();
				}
		}
});

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 $(element) {
		if (arguments.length > 1) {
				for (var i = 0, elements = [], length = arguments.length; i < length; i++)
						elements.push($(arguments[i]));
				return elements;
		}
		if (Object.isString(element))
				element = document.getElementById(element);
		return Element.extend(element);
}

if (Prototype.BrowserFeatures.XPath) {
		document._getElementsByXPath = function(expression, parentElement) {
				var results = [];
				var query = document.evaluate(expression, $(parentElement) || document,
						null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
				for (var i = 0, length = query.snapshotLength; i < length; i++)
						results.push(Element.extend(query.snapshotItem(i)));
				return results;
		};
}

/*--------------------------------------------------------------------------*/

if (!window.Node) var Node = { };

if (!Node.ELEMENT_NODE) {
		// DOM level 2 ECMAScript Language Binding
		Object.extend(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
		});
}

(function() {
		var element = this.Element;
		this.Element = function(tagName, attributes) {
				attributes = attributes || { };
				tagName = tagName.toLowerCase();
				var cache = Element.cache;
				if (Prototype.Browser.IE && attributes.name) {
						tagName = '<' + tagName + ' name="' + attributes.name + '">';
						delete attributes.name;
						return Element.writeAttribute(document.createElement(tagName), attributes);
				}
				if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
				return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
		};
		Object.extend(this.Element, element || { });
}).call(window);

Element.cache = { };

Element.Methods = {
		visible: function(element) {
				return $(element).style.display != 'none';
		},

		toggle: function(element) {
				element = $(element);
				Element[Element.visible(element) ? 'hide' : 'show'](element);
				return element;
		},

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

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

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

		update: function(element, content) {
				element = $(element);
				if (content && content.toElement) content = content.toElement();
				if (Object.isElement(content)) return element.update().insert(content);
				content = Object.toHTML(content);
				element.innerHTML = content.stripScripts();
				content.evalScripts.bind(content).defer();
				return element;
		},

		replace: function(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;
		},

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

				if (Object.isString(insertions) || Object.isNumber(insertions) ||
								Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
										insertions = {bottom:insertions};

				var content, t, range;

				for (position in insertions) {
						content  = insertions[position];
						position = position.toLowerCase();
						t = Element._insertionTranslations[position];

						if (content && content.toElement) content = content.toElement();
						if (Object.isElement(content)) {
								t.insert(element, content);
								continue;
						}

						content = Object.toHTML(content);

						range = element.ownerDocument.createRange();
						t.initializeRange(element, range);
						t.insert(element, range.createContextualFragment(content.stripScripts()));

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

				return element;
		},

		wrap: function(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;
		},

		inspect: function(element) {
				element = $(element);
				var result = '<' + element.tagName.toLowerCase();
				$H({'id': 'id', 'className': 'class'}).each(function(pair) {
						var property = pair.first(), attribute = pair.last();
						var value = (element[property] || '').toString();
						if (value) result += ' ' + attribute + '=' + value.inspect(true);
				});
				return result + '>';
		},

		recursivelyCollect: function(element, property) {
				element = $(element);
				var elements = [];
				while (element = element[property])
						if (element.nodeType == 1)
								elements.push(Element.extend(element));
				return elements;
		},

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

		descendants: function(element) {
				return $A($(element).getElementsByTagName('*')).each(Element.extend);
		},

		firstDescendant: function(element) {
				element = $(element).firstChild;
				while (element && element.nodeType != 1) element = element.nextSibling;
				return $(element);
		},

		immediateDescendants: function(element) {
				if (!(element = $(element).firstChild)) return [];
				while (element && element.nodeType != 1) element = element.nextSibling;
				if (element) return [element].concat($(element).nextSiblings());
				return [];
		},

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

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

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

		match: function(element, selector) {
				if (Object.isString(selector))
						selector = new Selector(selector);
				return selector.match($(element));
		},

		up: function(element, expression, index) {
				element = $(element);
				if (arguments.length == 1) return $(element.parentNode);
				var ancestors = element.ancestors();
				return expression ? Selector.findElement(ancestors, expression, index) :
						ancestors[index || 0];
		},

		down: function(element, expression, index) {
				element = $(element);
				if (arguments.length == 1) return element.firstDescendant();
				var descendants = element.descendants();
				return expression ? Selector.findElement(descendants, expression, index) :
						descendants[index || 0];
		},

		previous: function(element, expression, index) {
				element = $(element);
				if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
				var previousSiblings = element.previousSiblings();
				return expression ? Selector.findElement(previousSiblings, expression, index) :
						previousSiblings[index || 0];
		},

		next: function(element, expression, index) {
				element = $(element);
				if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
				var nextSiblings = element.nextSiblings();
				return expression ? Selector.findElement(nextSiblings, expression, index) :
						nextSiblings[index || 0];
		},

		select: function() {
				var args = $A(arguments), element = $(args.shift());
				return Selector.findChildElements(element, args);
		},

		adjacent: function() {
				var args = $A(arguments), element = $(args.shift());
				return Selector.findChildElements(element.parentNode, args).without(element);
		},

		identify: function(element) {
				element = $(element);
				var id = element.readAttribute('id'), self = arguments.callee;
				if (id) return id;
				do { id = 'anonymous_element_' + self.counter++ } while ($(id));
				element.writeAttribute('id', id);
				return id;
		},

		readAttribute: function(element, name) {
				element = $(element);
				if (Prototype.Browser.IE) {
						var t = Element._attributeTranslations.read;
						if (t.values[name]) return t.values[name](element, name);
						if (t.names[name]) name = t.names[name];
						if (name.include(':')) {
								return (!element.attributes || !element.attributes[name]) ? null :
									element.attributes[name].value;
						}
				}
				return element.getAttribute(name);
		},

		writeAttribute: function(element, name, value) {
				element = $(element);
				var attributes = { }, t = Element._attributeTranslations.write;

				if (typeof name == 'object') attributes = name;
				else attributes[name] = value === undefined ? true : value;

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

		getHeight: function(element) {
				return $(element).getDimensions().height;
		},

		getWidth: function(element) {
				return $(element).getDimensions().width;
		},

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

		hasClassName: function(element, className) {
				if (!(element = $(element))) return;
				var elementClassName = element.className;
				return (elementClassName.length > 0 && (elementClassName == className ||
						new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
		},

		addClassName: function(element, className) {
				if (!(element = $(element))) return;
				if (!element.hasClassName(className))
						element.className += (element.className ? ' ' : '') + className;
				return element;
		},

		removeClassName: function(element, className) {
				if (!(element = $(element))) return;
				element.className = element.className.replace(
						new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
				return element;
		},

		toggleClassName: function(element, className) {
				if (!(element = $(element))) return;
				return element[element.hasClassName(className) ?
						'removeClassName' : 'addClassName'](className);
		},

		// removes whitespace-only text node children
		cleanWhitespace: function(element) {
				element = $(element);
				var node = element.firstChild;
				while (node) {
						var nextNode = node.nextSibling;
						if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
								element.removeChild(node);
						node = nextNode;
				}
				return element;
		},

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

		descendantOf: function(element, ancestor) {
				element = $(element), ancestor = $(ancestor);

				if (element.compareDocumentPosition)
						return (element.compareDocumentPosition(ancestor) & 8) === 8;

				if (element.sourceIndex && !Prototype.Browser.Opera) {
						var e = element.sourceIndex, a = ancestor.sourceIndex,
							nextAncestor = ancestor.nextSibling;
						if (!nextAncestor) {
								do { ancestor = ancestor.parentNode; }
								while (!(nextAncestor = ancestor.nextSibling) && ancestor.parentNode);
						}
						if (nextAncestor) return (e > a && e < nextAncestor.sourceIndex);
				}

				while (element = element.parentNode)
						if (element == ancestor) return true;
				return false;
		},

		scrollTo: function(element) {
				element = $(element);
				var pos = element.cumulativeOffset();
				window.scrollTo(pos[0], pos[1]);
				return element;
		},

		getStyle: function(element, style) {
				element = $(element);
				style = style == 'float' ? 'cssFloat' : style.camelize();
				var value = element.style[style];
				if (!value) {
						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;
		},

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

		setStyle: function(element, styles) {
				element = $(element);
				var elementStyle = element.style, match;
				if (Object.isString(styles)) {
						element.style.cssText += ';' + styles;
						return styles.include('opacity') ?
								element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
				}
				for (var property in styles)
						if (property == 'opacity') element.setOpacity(styles[property]);
						else
								elementStyle[(property == 'float' || property == 'cssFloat') ?
										(elementStyle.styleFloat === undefined ? 'cssFloat' : 'styleFloat') :
												property] = styles[property];

				return element;
		},

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

		getDimensions: function(element) {
				element = $(element);
				var display = $(element).getStyle('display');
				if (display != 'none' && display != null) // Safari bug
						return {width: element.offsetWidth, height: element.offsetHeight};

				// All *Width and *Height properties give 0 on elements with display none,
				// so enable the element temporarily
				var els = element.style;
				var originalVisibility = els.visibility;
				var originalPosition = els.position;
				var originalDisplay = els.display;
				els.visibility = 'hidden';
				els.position = 'absolute';
				els.display = 'block';
				var originalWidth = element.clientWidth;
				var originalHeight = element.clientHeight;
				els.display = originalDisplay;
				els.position = originalPosition;
				els.visibility = originalVisibility;
				return {width: originalWidth, height: originalHeight};
		},

		makePositioned: function(element) {
				element = $(element);
				var pos = Element.getStyle(element, 'position');
				if (pos == 'static' || !pos) {
						element._madePositioned = true;
						element.style.position = 'relative';
						// Opera returns the offset relative to the positioning context, when an
						// element is position relative but top and left have not been defined
						if (window.opera) {
								element.style.top = 0;
								element.style.left = 0;
						}
				}
				return element;
		},

		undoPositioned: function(element) {
				element = $(element);
				if (element._madePositioned) {
						element._madePositioned = undefined;
						element.style.position =
								element.style.top =
								element.style.left =
								element.style.bottom =
								element.style.right = '';
				}
				return element;
		},

		makeClipping: function(element) {
				element = $(element);
				if (element._overflow) return element;
				element._overflow = Element.getStyle(element, 'overflow') || 'auto';
				if (element._overflow !== 'hidden')
						element.style.overflow = 'hidden';
				return element;
		},

		undoClipping: function(element) {
				element = $(element);
				if (!element._overflow) return element;
				element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
				element._overflow = null;
				return element;
		},

		cumulativeOffset: function(element) {
				var valueT = 0, valueL = 0;
				do {
						valueT += element.offsetTop  || 0;
						valueL += element.offsetLeft || 0;
						element = element.offsetParent;
				} while (element);
				return Element._returnOffset(valueL, valueT);
		},

		positionedOffset: function(element) {
				var valueT = 0, valueL = 0;
				do {
						valueT += element.offsetTop  || 0;
						valueL += element.offsetLeft || 0;
						element = element.offsetParent;
						if (element) {
								if (element.tagName == 'BODY') break;
								var p = Element.getStyle(element, 'position');
								if (p == 'relative' || p == 'absolute') break;
						}
				} while (element);
				return Element._returnOffset(valueL, valueT);
		},

		absolutize: function(element) {
				element = $(element);
				if (element.getStyle('position') == 'absolute') return;
				// Position.prepare(); // To be done manually by Scripty when it needs it.

				var offsets = element.positionedOffset();
				var top     = offsets[1];
				var left    = offsets[0];
				var width   = element.clientWidth;
				var height  = element.clientHeight;

				element._originalLeft   = left - parseFloat(element.style.left  || 0);
				element._originalTop    = top  - parseFloat(element.style.top || 0);
				element._originalWidth  = element.style.width;
				element._originalHeight = element.style.height;

				element.style.position = 'absolute';
				element.style.top    = top + 'px';
				element.style.left   = left + 'px';
				element.style.width  = width + 'px';
				element.style.height = height + 'px';
				return element;
		},

		relativize: function(element) {
				element = $(element);
				if (element.getStyle('position') == 'relative') return;
				// Position.prepare(); // To be done manually by Scripty when it needs it.

				element.style.position = 'relative';
				var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
				var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);

				element.style.top    = top + 'px';
				element.style.left   = left + 'px';
				element.style.height = element._originalHeight;
				element.style.width  = element._originalWidth;
				return element;
		},

		cumulativeScrollOffset: function(element) {
				var valueT = 0, valueL = 0;
				do {
						valueT += element.scrollTop  || 0;
						valueL += element.scrollLeft || 0;
						element = element.parentNode;
				} while (element);
				return Element._returnOffset(valueL, valueT);
		},

		getOffsetParent: function(element) {
				if (element.offsetParent) return $(element.offsetParent);
				if (element == document.body) return $(element);

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

				return $(document.body);
		},

		viewportOffset: function(forElement) {
				var valueT = 0, valueL = 0;

				var element = forElement;
				do {
						valueT += element.offsetTop  || 0;
						valueL += element.offsetLeft || 0;

						// Safari fix
						if (element.offsetParent == document.body &&
								Element.getStyle(element, 'position') == 'absolute') break;

				} while (element = element.offsetParent);

				element = forElement;
				do {
						if (!Prototype.Browser.Opera || element.tagName == 'BODY') {
								valueT -= element.scrollTop  || 0;
								valueL -= element.scrollLeft || 0;
						}
				} while (element = element.parentNode);

				return Element._returnOffset(valueL, valueT);
		},

		clonePosition: function(element, source) {
				var options = Object.extend({
						setLeft:    true,
						setTop:     true,
						setWidth:   true,
						setHeight:  true,
						offsetTop:  0,
						offsetLeft: 0
				}, arguments[2] || { });

				// find page position of source
				source = $(source);
				var p = source.viewportOffset();

				// find coordinate system to use
				element = $(element);
				var delta = [0, 0];
				var parent = null;
				// delta [0,0] will do fine with position: fixed elements,
				// position:absolute needs offsetParent deltas
				if (Element.getStyle(element, 'position') == 'absolute') {
						parent = element.getOffsetParent();
						delta = parent.viewportOffset();
				}

				// correct by body offsets (fixes Safari)
				if (parent == document.body) {
						delta[0] -= document.body.offsetLeft;
						delta[1] -= document.body.offsetTop;
				}

				// set position
				if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
				if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
				if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
				if (options.setHeight) element.style.height = source.offsetHeight + 'px';
				return element;
		}
};

Element.Methods.identify.counter = 1;

Object.extend(Element.Methods, {
		getElementsBySelector: Element.Methods.select,
		childElements: Element.Methods.immediateDescendants
});

Element._attributeTranslations = {
		write: {
				names: {
						className: 'class',
						htmlFor:   'for'
				},
				values: { }
		}
};


if (!document.createRange || Prototype.Browser.Opera) {
		Element.Methods.insert = function(element, insertions) {
				element = $(element);

				if (Object.isString(insertions) || Object.isNumber(insertions) ||
								Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
										insertions = { bottom: insertions };

				var t = Element._insertionTranslations, content, position, pos, tagName;

				for (position in insertions) {
						content  = insertions[position];
						position = position.toLowerCase();
						pos      = t[position];

						if (content && content.toElement) content = content.toElement();
						if (Object.isElement(content)) {
								pos.insert(element, content);
								continue;
						}

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

						if (t.tags[tagName]) {
								var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
								if (position == 'top' || position == 'after') fragments.reverse();
								fragments.each(pos.insert.curry(element));
						}
						else element.insertAdjacentHTML(pos.adjacency, content.stripScripts());

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

				return element;
		};
}

if (Prototype.Browser.Opera) {
		Element.Methods._getStyle = Element.Methods.getStyle;
		Element.Methods.getStyle = function(element, style) {
				switch(style) {
						case 'left':
						case 'top':
						case 'right':
						case 'bottom':
								if (Element._getStyle(element, 'position') == 'static') return null;
						default: return Element._getStyle(element, style);
				}
		};
		Element.Methods._readAttribute = Element.Methods.readAttribute;
		Element.Methods.readAttribute = function(element, attribute) {
				if (attribute == 'title') return element.title;
				return Element._readAttribute(element, attribute);
		};
}

else if (Prototype.Browser.IE) {
		$w('positionedOffset getOffsetParent viewportOffset').each(function(method) {
				Element.Methods[method] = Element.Methods[method].wrap(
						function(proceed, element) {
								element = $(element);
								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;
						}
				);
		});

		Element.Methods.getStyle = function(element, style) {
				element = $(element);
				style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
				var value = element.style[style];
				if (!value && element.currentStyle) value = element.currentStyle[style];

				if (style == 'opacity') {
						if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
								if (value[1]) return parseFloat(value[1]) / 100;
						return 1.0;
				}

				if (value == 'auto') {
						if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
								return element['offset' + style.capitalize()] + 'px';
						return null;
				}
				return value;
		};

		Element.Methods.setOpacity = function(element, value) {
				function stripAlpha(filter){
						return filter.replace(/alpha\([^\)]*\)/gi,'');
				}
				element = $(element);
				var currentStyle = element.currentStyle;
				if ((currentStyle && !currentStyle.hasLayout) ||
						(!currentStyle && element.style.zoom == 'normal'))
								element.style.zoom = 1;

				var filter = element.getStyle('filter'), style = element.style;
				if (value == 1 || value === '') {
						(filter = stripAlpha(filter)) ?
								style.filter = filter : style.removeAttribute('filter');
						return element;
				} else if (value < 0.00001) value = 0;
				style.filter = stripAlpha(filter) +
						'alpha(opacity=' + (value * 100) + ')';
				return element;
		};

		Element._attributeTranslations = {
				read: {
						names: {
								'class': 'className',
								'for':   'htmlFor'
						},
						values: {
								_getAttr: function(element, attribute) {
										return element.getAttribute(attribute, 2);
								},
								_getAttrNode: function(element, attribute) {
										var node = element.getAttributeNode(attribute);
										return node ? node.value : "";
								},
								_getEv: function(element, attribute) {
										var attribute = element.getAttribute(attribute);
										return attribute ? attribute.toString().slice(23, -2) : null;
								},
								_flag: function(element, attribute) {
										return $(element).hasAttribute(attribute) ? attribute : null;
								},
								style: function(element) {
										return element.style.cssText.toLowerCase();
								},
								title: function(element) {
										return element.title;
								}
						}
				}
		};

		Element._attributeTranslations.write = {
				names: Object.clone(Element._attributeTranslations.read.names),
				values: {
						checked: function(element, value) {
								element.checked = !!value;
						},

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

		Element._attributeTranslations.has = {};

		$w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
						'encType maxLength readOnly longDesc').each(function(attr) {
				Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
				Element._attributeTranslations.has[attr.toLowerCase()] = attr;
		});

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

else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
		Element.Methods.setOpacity = function(element, value) {
				element = $(element);
				element.style.opacity = (value == 1) ? 0.999999 :
						(value === '') ? '' : (value < 0.00001) ? 0 : value;
				return element;
		};
}

else if (Prototype.Browser.WebKit) {
		Element.Methods.setOpacity = function(element, value) {
				element = $(element);
				element.style.opacity = (value == 1 || value === '') ? '' :
						(value < 0.00001) ? 0 : value;

				if (value == 1)
						if(element.tagName == 'IMG' && element.width) {
								element.width++; element.width--;
						} else try {
								var n = document.createTextNode(' ');
								element.appendChild(n);
								element.removeChild(n);
						} catch (e) { }

				return element;
		};

		// Safari returns margins on body which is incorrect if the child is absolutely
		// positioned.  For performance reasons, redefine Position.cumulativeOffset for
		// KHTML/WebKit only.
		Element.Methods.cumulativeOffset = function(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 Element._returnOffset(valueL, valueT);
		};
}

if (Prototype.Browser.IE || Prototype.Browser.Opera) {
		// IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
		Element.Methods.update = function(element, content) {
				element = $(element);

				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 in Element._insertionTranslations.tags) {
						$A(element.childNodes).each(function(node) { element.removeChild(node) });
						Element._getContentFromAnonymousElement(tagName, content.stripScripts())
								.each(function(node) { element.appendChild(node) });
				}
				else element.innerHTML = content.stripScripts();

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

if (document.createElement('div').outerHTML) {
		Element.Methods.replace = function(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 (Element._insertionTranslations.tags[tagName]) {
						var nextSibling = element.next();
						var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
						parent.removeChild(element);
						if (nextSibling)
								fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
						else
								fragments.each(function(node) { parent.appendChild(node) });
				}
				else element.outerHTML = content.stripScripts();

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

Element._returnOffset = function(l, t) {
		var result = [l, t];
		result.left = l;
		result.top = t;
		return result;
};

Element._getContentFromAnonymousElement = function(tagName, html) {
		var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
		div.innerHTML = t[0] + html + t[1];
		t[2].times(function() { div = div.firstChild });
		return $A(div.childNodes);
};

Element._insertionTranslations = {
		before: {
				adjacency: 'beforeBegin',
				insert: function(element, node) {
						element.parentNode.insertBefore(node, element);
				},
				initializeRange: function(element, range) {
						range.setStartBefore(element);
				}
		},
		top: {
				adjacency: 'afterBegin',
				insert: function(element, node) {
						element.insertBefore(node, element.firstChild);
				},
				initializeRange: function(element, range) {
						range.selectNodeContents(element);
						range.collapse(true);
				}
		},
		bottom: {
				adjacency: 'beforeEnd',
				insert: function(element, node) {
						element.appendChild(node);
				}
		},
		after: {
				adjacency: 'afterEnd',
				insert: function(element, node) {
						element.parentNode.insertBefore(node, element.nextSibling);
				},
				initializeRange: function(element, range) {
						range.setStartAfter(element);
				}
		},
		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]
		}
};

(function() {
		this.bottom.initializeRange = this.top.initializeRange;
		Object.extend(this.tags, {
				THEAD: this.tags.TBODY,
				TFOOT: this.tags.TBODY,
				TH:    this.tags.TD
		});
}).call(Element._insertionTranslations);

Element.Methods.Simulated = {
		hasAttribute: function(element, attribute) {
				attribute = Element._attributeTranslations.has[attribute] || attribute;
				var node = $(element).getAttributeNode(attribute);
				return node && node.specified;
		}
};

Element.Methods.ByTag = { };

Object.extend(Element, Element.Methods);

if (!Prototype.BrowserFeatures.ElementExtensions &&
				document.createElement('div').__proto__) {
		window.HTMLElement = { };
		window.HTMLElement.prototype = document.createElement('div').__proto__;
		Prototype.BrowserFeatures.ElementExtensions = true;
}

Element.extend = (function() {
		if (Prototype.BrowserFeatures.SpecificElementExtensions)
				return Prototype.K;

		var Methods = { }, ByTag = Element.Methods.ByTag;

		var extend = Object.extend(function(element) {
				if (!element || element._extendedByPrototype ||
								element.nodeType != 1 || element == window) return element;

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

				// extend methods for specific tags
				if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);

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

				element._extendedByPrototype = Prototype.emptyFunction;
				return element;

		}, {
				refresh: function() {
						// extend methods for all tags (Safari doesn't need this)
						if (!Prototype.BrowserFeatures.ElementExtensions) {
								Object.extend(Methods, Element.Methods);
								Object.extend(Methods, Element.Methods.Simulated);
						}
				}
		});

		extend.refresh();
		return extend;
})();

Element.hasAttribute = function(element, attribute) {
		if (element.hasAttribute) return element.hasAttribute(attribute);
		return Element.Methods.Simulated.hasAttribute(element, attribute);
};

Element.addMethods = function(methods) {
		var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;

		if (!methods) {
				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)
				});
		}

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

		if (!tagName) Object.extend(Element.Methods, methods || { });
		else {
				if (Object.isArray(tagName)) tagName.each(extend);
				else extend(tagName);
		}

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

		function copy(methods, destination, onlyIfAbsent) {
				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];

				window[klass] = { };
				window[klass].prototype = document.createElement(tagName).__proto__;
				return window[klass];
		}

		if (F.ElementExtensions) {
				copy(Element.Methods, HTMLElement.prototype);
				copy(Element.Methods.Simulated, HTMLElement.prototype, true);
		}

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

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

		if (Element.extend.refresh) Element.extend.refresh();
		Element.cache = { };
};

document.viewport = {
		getDimensions: function() {
				var dimensions = { };
				$w('width height').each(function(d) {
						var D = d.capitalize();
						dimensions[d] = self['inner' + D] ||
							(document.documentElement['client' + D] || document.body['client' + D]);
				});
				return dimensions;
		},

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

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

		getScrollOffsets: function() {
				return Element._returnOffset(
						window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
						window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
		}
};
/* Portions of the Selector class are derived from Jack Slocum’s DomQuery,
	* part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
	* license.  Please see http://www.yui-ext.com/ for more information. */

var Selector = Class.create({
		initialize: function(expression) {
				this.expression = expression.strip();
				this.compileMatcher();
		},

		compileMatcher: function() {
				// Selectors with namespaced attributes can't use the XPath version
				if (Prototype.BrowserFeatures.XPath && !(/(\[[\w-]*?:|:checked)/).test(this.expression))
						return this.compileXPathMatcher();

				var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
								c = Selector.criteria, le, p, m;

				if (Selector._cache[e]) {
						this.matcher = Selector._cache[e];
						return;
				}

				this.matcher = ["this.matcher = function(root) {",
																				"var r = root, h = Selector.handlers, c = false, n;"];

				while (e && le != e && (/\S/).test(e)) {
						le = e;
						for (var i in ps) {
								p = ps[i];
								if (m = e.match(p)) {
										this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
											new Template(c[i]).evaluate(m));
										e = e.replace(m[0], '');
										break;
								}
						}
				}

				this.matcher.push("return h.unique(n);\n}");
				eval(this.matcher.join('\n'));
				Selector._cache[this.expression] = this.matcher;
		},

		compileXPathMatcher: function() {
				var e = this.expression, ps = Selector.patterns,
								x = Selector.xpath, le, m;

				if (Selector._cache[e]) {
						this.xpath = Selector._cache[e]; return;
				}

				this.matcher = ['.//*'];
				while (e && le != e && (/\S/).test(e)) {
						le = e;
						for (var i in ps) {
								if (m = e.match(ps[i])) {
										this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
												new Template(x[i]).evaluate(m));
										e = e.replace(m[0], '');
										break;
								}
						}
				}

				this.xpath = this.matcher.join('');
				Selector._cache[this.expression] = this.xpath;
		},

		findElements: function(root) {
				root = root || document;
				if (this.xpath) return document._getElementsByXPath(this.xpath, root);
				return this.matcher(root);
		},

		match: function(element) {
				this.tokens = [];

				var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
				var le, p, m;

				while (e && le !== e && (/\S/).test(e)) {
						le = e;
						for (var i in ps) {
								p = ps[i];
								if (m = e.match(p)) {
										// use the Selector.assertions methods unless the selector
										// is too complex.
										if (as[i]) {
												this.tokens.push([i, Object.clone(m)]);
												e = e.replace(m[0], '');
										} else {
												// reluctantly do a document-wide search
												// and look for a match in the array
												return this.findElements(document).include(element);
										}
								}
						}
				}

				var match = true, name, matches;
				for (var i = 0, token; token = this.tokens[i]; i++) {
						name = token[0], matches = token[1];
						if (!Selector.assertions[name](element, matches)) {
								match = false; break;
						}
				}

				return match;
		},

		toString: function() {
				return this.expression;
		},

		inspect: function() {
				return "#<Selector:" + this.expression.inspect() + ">";
		}
});

Object.extend(Selector, {
		_cache: { },

		xpath: {
				descendant:   "//*",
				child:        "/*",
				adjacent:     "/following-sibling::*[1]",
				laterSibling: '/following-sibling::*',
				tagName:      function(m) {
						if (m[1] == '*') return '';
						return "[local-name()='" + m[1].toLowerCase() +
													"' or local-name()='" + m[1].toUpperCase() + "']";
				},
				className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
				id:           "[@id='#{1}']",
				attrPresence: "[@#{1}]",
				attr: function(m) {
						m[3] = m[5] || m[6];
						return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
				},
				pseudo: function(m) {
						var h = Selector.xpath.pseudos[m[1]];
						if (!h) return '';
						if (Object.isFunction(h)) return h(m);
						return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
				},
				operators: {
						'=':  "[@#{1}='#{3}']",
						'!=': "[@#{1}!='#{3}']",
						'^=': "[starts-with(@#{1}, '#{3}')]",
						'$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
						'*=': "[contains(@#{1}, '#{3}')]",
						'~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
						'|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
				},
				pseudos: {
						'first-child': '[not(preceding-sibling::*)]',
						'last-child':  '[not(following-sibling::*)]',
						'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
						'empty':       "[count(*) = 0 and (count(text()) = 0 or translate(text(), ' \t\r\n', '') = '')]",
						'checked':     "[@checked]",
						'disabled':    "[@disabled]",
						'enabled':     "[not(@disabled)]",
						'not': function(m) {
								var e = m[6], p = Selector.patterns,
												x = Selector.xpath, le, m, v;

								var exclusion = [];
								while (e && le != e && (/\S/).test(e)) {
										le = e;
										for (var i in p) {
												if (m = e.match(p[i])) {
														v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
														exclusion.push("(" + v.substring(1, v.length - 1) + ")");
														e = e.replace(m[0], '');
														break;
												}
										}
								}
								return "[not(" + exclusion.join(" and ") + ")]";
						},
						'nth-child':      function(m) {
								return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
						},
						'nth-last-child': function(m) {
								return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
						},
						'nth-of-type':    function(m) {
								return Selector.xpath.pseudos.nth("position() ", m);
						},
						'nth-last-of-type': function(m) {
								return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
						},
						'first-of-type':  function(m) {
								m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
						},
						'last-of-type':   function(m) {
								m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
						},
						'only-of-type':   function(m) {
								var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
						},
						nth: function(fragment, m) {
								var mm, formula = m[6], predicate;
								if (formula == 'even') formula = '2n+0';
								if (formula == 'odd')  formula = '2n+1';
								if (mm = formula.match(/^(\d+)$/)) // digit only
										return '[' + fragment + "= " + mm[1] + ']';
								if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
										if (mm[1] == "-") mm[1] = -1;
										var a = mm[1] ? Number(mm[1]) : 1;
										var b = mm[2] ? Number(mm[2]) : 0;
										predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
										"((#{fragment} - #{b}) div #{a} >= 0)]";
										return new Template(predicate).evaluate({
												fragment: fragment, a: a, b: b });
								}
						}
				}
		},

		criteria: {
				tagName:      'n = h.tagName(n, r, "#{1}", c);   c = false;',
				className:    'n = h.className(n, r, "#{1}", c); c = false;',
				id:           'n = h.id(n, r, "#{1}", c);        c = false;',
				attrPresence: 'n = h.attrPresence(n, r, "#{1}"); c = false;',
				attr: function(m) {
						m[3] = (m[5] || m[6]);
						return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}"); c = false;').evaluate(m);
				},
				pseudo: function(m) {
						if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
						return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
				},
				descendant:   'c = "descendant";',
				child:        'c = "child";',
				adjacent:     'c = "adjacent";',
				laterSibling: 'c = "laterSibling";'
		},

		patterns: {
				// combinators must be listed first
				// (and descendant needs to be last combinator)
				laterSibling: /^\s*~\s*/,
				child:        /^\s*>\s*/,
				adjacent:     /^\s*\+\s*/,
				descendant:   /^\s/,

				// selectors follow
				tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
				id:           /^#([\w\-\*]+)(\b|$)/,
				className:    /^\.([\w\-\*]+)(\b|$)/,
				pseudo:       /^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s)|(?=:))/,
				attrPresence: /^\[([\w]+)\]/,
				attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
		},

		// for Selector.match and Element#match
		assertions: {
				tagName: function(element, matches) {
						return matches[1].toUpperCase() == element.tagName.toUpperCase();
				},

				className: function(element, matches) {
						return Element.hasClassName(element, matches[1]);
				},

				id: function(element, matches) {
						return element.id === matches[1];
				},

				attrPresence: function(element, matches) {
						return Element.hasAttribute(element, matches[1]);
				},

				attr: function(element, matches) {
						var nodeValue = Element.readAttribute(element, matches[1]);
						return Selector.operators[matches[2]](nodeValue, matches[3]);
				}
		},

		handlers: {
				// UTILITY FUNCTIONS
				// joins two collections
				concat: function(a, b) {
						for (var i = 0, node; node = b[i]; i++)
								a.push(node);
						return a;
				},

				// marks an array of nodes for counting
				mark: function(nodes) {
						for (var i = 0, node; node = nodes[i]; i++)
								node._counted = true;
						return nodes;
				},

				unmark: function(nodes) {
						for (var i = 0, node; node = nodes[i]; i++)
								node._counted = undefined;
						return nodes;
				},

				// mark each child node with its position (for nth calls)
				// "ofType" flag indicates whether we're indexing for nth-of-type
				// rather than nth-child
				index: function(parentNode, reverse, ofType) {
						parentNode._counted = true;
						if (reverse) {
								for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
										var node = nodes[i];
										if (node.nodeType == 1 && (!ofType || node._counted)) node.nodeIndex = j++;
								}
						} else {
								for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
										if (node.nodeType == 1 && (!ofType || node._counted)) node.nodeIndex = j++;
						}
				},

				// filters out duplicates and extends all nodes
				unique: function(nodes) {
						if (nodes.length == 0) return nodes;
						var results = [], n;
						for (var i = 0, l = nodes.length; i < l; i++)
								if (!(n = nodes[i])._counted) {
										n._counted = true;
										results.push(Element.extend(n));
								}
						return Selector.handlers.unmark(results);
				},

				// COMBINATOR FUNCTIONS
				descendant: function(nodes) {
						var h = Selector.handlers;
						for (var i = 0, results = [], node; node = nodes[i]; i++)
								h.concat(results, node.getElementsByTagName('*'));
						return results;
				},

				child: function(nodes) {
						var h = Selector.handlers;
						for (var i = 0, results = [], node; node = nodes[i]; i++) {
								for (var j = 0, children = [], child; child = node.childNodes[j]; j++)
										if (child.nodeType == 1 && child.tagName != '!') results.push(child);
						}
						return results;
				},

				adjacent: function(nodes) {
						for (var i = 0, results = [], node; node = nodes[i]; i++) {
								var next = this.nextElementSibling(node);
								if (next) results.push(next);
						}
						return results;
				},

				laterSibling: function(nodes) {
						var h = Selector.handlers;
						for (var i = 0, results = [], node; node = nodes[i]; i++)
								h.concat(results, Element.nextSiblings(node));
						return results;
				},

				nextElementSibling: function(node) {
						while (node = node.nextSibling)
							if (node.nodeType == 1) return node;
						return null;
				},

				previousElementSibling: function(node) {
						while (node = node.previousSibling)
								if (node.nodeType == 1) return node;
						return null;
				},

				// TOKEN FUNCTIONS
				tagName: function(nodes, root, tagName, combinator) {
						tagName = tagName.toUpperCase();
						var results = [], h = Selector.handlers;
						if (nodes) {
								if (combinator) {
										// fastlane for ordinary descendant combinators
										if (combinator == "descendant") {
												for (var i = 0, node; node = nodes[i]; i++)
														h.concat(results, node.getElementsByTagName(tagName));
												return results;
										} else nodes = this[combinator](nodes);
										if (tagName == "*") return nodes;
								}
								for (var i = 0, node; node = nodes[i]; i++)
										if (node.tagName.toUpperCase() == tagName) results.push(node);
								return results;
						} else return root.getElementsByTagName(tagName);
				},

				id: function(nodes, root, id, combinator) {
						var targetNode = $(id), h = Selector.handlers;
						if (!targetNode) return [];
						if (!nodes && root == document) return [targetNode];
						if (nodes) {
								if (combinator) {
										if (combinator == 'child') {
												for (var i = 0, node; node = nodes[i]; i++)
														if (targetNode.parentNode == node) return [targetNode];
										} else if (combinator == 'descendant') {
												for (var i = 0, node; node = nodes[i]; i++)
														if (Element.descendantOf(targetNode, node)) return [targetNode];
										} else if (combinator == 'adjacent') {
												for (var i = 0, node; node = nodes[i]; i++)
														if (Selector.handlers.previousElementSibling(targetNode) == node)
																return [targetNode];
										} else nodes = h[combinator](nodes);
								}
								for (var i = 0, node; node = nodes[i]; i++)
										if (node == targetNode) return [targetNode];
								return [];
						}
						return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
				},

				className: function(nodes, root, className, combinator) {
						if (nodes && combinator) nodes = this[combinator](nodes);
						return Selector.handlers.byClassName(nodes, root, className);
				},

				byClassName: function(nodes, root, className) {
						if (!nodes) nodes = Selector.handlers.descendant([root]);
						var needle = ' ' + className + ' ';
						for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
								nodeClassName = node.className;
								if (nodeClassName.length == 0) continue;
								if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
										results.push(node);
						}
						return results;
				},

				attrPresence: function(nodes, root, attr) {
						if (!nodes) nodes = root.getElementsByTagName("*");
						var results = [];
						for (var i = 0, node; node = nodes[i]; i++)
								if (Element.hasAttribute(node, attr)) results.push(node);
						return results;
				},

				attr: function(nodes, root, attr, value, operator) {
						if (!nodes) nodes = root.getElementsByTagName("*");
						var handler = Selector.operators[operator], results = [];
						for (var i = 0, node; node = nodes[i]; i++) {
								var nodeValue = Element.readAttribute(node, attr);
								if (nodeValue === null) continue;
								if (handler(nodeValue, value)) results.push(node);
						}
						return results;
				},

				pseudo: function(nodes, name, value, root, combinator) {
						if (nodes && combinator) nodes = this[combinator](nodes);
						if (!nodes) nodes = root.getElementsByTagName("*");
						return Selector.pseudos[name](nodes, value, root);
				}
		},

		pseudos: {
				'first-child': function(nodes, value, root) {
						for (var i = 0, results = [], node; node = nodes[i]; i++) {
								if (Selector.handlers.previousElementSibling(node)) continue;
										results.push(node);
						}
						return results;
				},
				'last-child': function(nodes, value, root) {
						for (var i = 0, results = [], node; node = nodes[i]; i++) {
								if (Selector.handlers.nextElementSibling(node)) continue;
										results.push(node);
						}
						return results;
				},
				'only-child': function(nodes, value, root) {
						var h = Selector.handlers;
						for (var i = 0, results = [], node; node = nodes[i]; i++)
								if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
										results.push(node);
						return results;
				},
				'nth-child':        function(nodes, formula, root) {
						return Selector.pseudos.nth(nodes, formula, root);
				},
				'nth-last-child':   function(nodes, formula, root) {
						return Selector.pseudos.nth(nodes, formula, root, true);
				},
				'nth-of-type':      function(nodes, formula, root) {
						return Selector.pseudos.nth(nodes, formula, root, false, true);
				},
				'nth-last-of-type': function(nodes, formula, root) {
						return Selector.pseudos.nth(nodes, formula, root, true, true);
				},
				'first-of-type':    function(nodes, formula, root) {
						return Selector.pseudos.nth(nodes, "1", root, false, true);
				},
				'last-of-type':     function(nodes, formula, root) {
						return Selector.pseudos.nth(nodes, "1", root, true, true);
				},
				'only-of-type':     function(nodes, formula, root) {
						var p = Selector.pseudos;
						return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
				},

				// handles the an+b logic
				getIndices: function(a, b, total) {
						if (a == 0) return b > 0 ? [b] : [];
						return $R(1, total).inject([], function(memo, i) {
								if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
								return memo;
						});
				},

				// handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
				nth: function(nodes, formula, root, reverse, ofType) {
						if (nodes.length == 0) return [];
						if (formula == 'even') formula = '2n+0';
						if (formula == 'odd')  formula = '2n+1';
						var h = Selector.handlers, results = [], indexed = [], m;
						h.mark(nodes);
						for (var i = 0, node; node = nodes[i]; i++) {
								if (!node.parentNode._counted) {
										h.index(node.parentNode, reverse, ofType);
										indexed.push(node.parentNode);
								}
						}
						if (formula.match(/^\d+$/)) { // just a number
								formula = Number(formula);
								for (var i = 0, node; node = nodes[i]; i++)
										if (node.nodeIndex == formula) results.push(node);
						} else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
								if (m[1] == "-") m[1] = -1;
								var a = m[1] ? Number(m[1]) : 1;
								var b = m[2] ? Number(m[2]) : 0;
								var indices = Selector.pseudos.getIndices(a, b, nodes.length);
								for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
										for (var j = 0; j < l; j++)
												if (node.nodeIndex == indices[j]) results.push(node);
								}
						}
						h.unmark(nodes);
						h.unmark(indexed);
						return results;
				},

				'empty': function(nodes, value, root) {
						for (var i = 0, results = [], node; node = nodes[i]; i++) {
								// IE treats comments as element nodes
								if (node.tagName == '!' || (node.firstChild && !node.innerHTML.match(/^\s*$/))) continue;
								results.push(node);
						}
						return results;
				},

				'not': function(nodes, selector, root) {
						var h = Selector.handlers, selectorType, m;
						var exclusions = new Selector(selector).findElements(root);
						h.mark(exclusions);
						for (var i = 0, results = [], node; node = nodes[i]; i++)
								if (!node._counted) results.push(node);
						h.unmark(exclusions);
						return results;
				},

				'enabled': function(nodes, value, root) {
						for (var i = 0, results = [], node; node = nodes[i]; i++)
								if (!node.disabled) results.push(node);
						return results;
				},

				'disabled': function(nodes, value, root) {
						for (var i = 0, results = [], node; node = nodes[i]; i++)
								if (node.disabled) results.push(node);
						return results;
				},

				'checked': function(nodes, value, root) {
						for (var i = 0, results = [], node; node = nodes[i]; i++)
								if (node.checked) results.push(node);
						return results;
				}
		},

		operators: {
				'=':  function(nv, v) { return nv == v; },
				'!=': function(nv, v) { return nv != v; },
				'^=': function(nv, v) { return nv.startsWith(v); },
				'$=': function(nv, v) { return nv.endsWith(v); },
				'*=': function(nv, v) { return nv.include(v); },
				'~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
				'|=': function(nv, v) { return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-'); }
		},

		matchElements: function(elements, expression) {
				var matches = new Selector(expression).findElements(), h = Selector.handlers;
				h.mark(matches);
				for (var i = 0, results = [], element; element = elements[i]; i++)
						if (element._counted) results.push(element);
				h.unmark(matches);
				return results;
		},

		findElement: function(elements, expression, index) {
				if (Object.isNumber(expression)) {
						index = expression; expression = false;
				}
				return Selector.matchElements(elements, expression || '*')[index || 0];
		},

		findChildElements: function(element, expressions) {
				var exprs = expressions.join(','), expressions = [];
				exprs.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
						expressions.push(m[1].strip());
				});
				var results = [], h = Selector.handlers;
				for (var i = 0, l = expressions.length, selector; i < l; i++) {
						selector = new Selector(expressions[i].strip());
						h.concat(results, selector.findElements(element));
				}
				return (l > 1) ? h.unique(results) : results;
		}
});

function $$() {
		return Selector.findChildElements(document, $A(arguments));
}
var Form = {
		reset: function(form) {
				$(form).reset();
				return form;
		},

		serializeElements: function(elements, options) {
				if (typeof options != 'object') options = { hash: !!options };
				else if (options.hash === undefined) options.hash = true;
				var key, value, submitted = false, submit = options.submit;

				var data = elements.inject({ }, function(result, element) {
						if (!element.disabled && element.name) {
								key = element.name; value = $(element).getValue();
								if (value != null && (element.type != 'submit' || (!submitted &&
												submit !== false && (!submit || key == submit) && (submitted = true)))) {
										if (key in result) {
												// a key is already present; construct an array of values
												if (!Object.isArray(result[key])) result[key] = [result[key]];
												result[key].push(value);
										}
										else result[key] = value;
								}
						}
						return result;
				});

				return options.hash ? data : Object.toQueryString(data);
		}
};

Form.Methods = {
		serialize: function(form, options) {
				return Form.serializeElements(Form.getElements(form), options);
		},

		getElements: function(form) {
				return $A($(form).getElementsByTagName('*')).inject([],
						function(elements, child) {
								if (Form.Element.Serializers[child.tagName.toLowerCase()])
										elements.push(Element.extend(child));
								return elements;
						}
				);
		},

		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'].include(element.tagName.toLowerCase());
				});
		},

		focusFirstElement: function(form) {
				form = $(form);
				form.findFirstElement().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'].include(element.type)))
								element.select();
				} catch (e) { }
				return element;
		},

		disable: function(element) {
				element = $(element);
				element.blur();
				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 = {
		input: function(element, value) {
				switch (element.type.toLowerCase()) {
						case 'checkbox':
						case 'radio':
								return Form.Element.Serializers.inputSelector(element, value);
						default:
								return Form.Element.Serializers.textarea(element, value);
				}
		},

		inputSelector: function(element, value) {
				if (value === undefined) return element.checked ? element.value : null;
				else element.checked = !!value;
		},

		textarea: function(element, value) {
				if (value === undefined) return element.value;
				else element.value = value;
		},

		select: function(element, index) {
				if (index === undefined)
						return this[element.type == 'select-one' ?
								'selectOne' : 'selectMany'](element);
				else {
						var opt, value, single = !Object.isArray(index);
						for (var i = 0, length = element.length; i < length; i++) {
								opt = element.options[i];
								value = this.optionValue(opt);
								if (single) {
										if (value == index) {
												opt.selected = true;
												return;
										}
								}
								else opt.selected = index.include(value);
						}
				}
		},

		selectOne: function(element) {
				var index = element.selectedIndex;
				return index >= 0 ? this.optionValue(element.options[index]) : null;
		},

		selectMany: function(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(this.optionValue(opt));
				}
				return values;
		},

		optionValue: function(opt) {
				// extend element because hasAttribute may not be native
				return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
		}
};

/*--------------------------------------------------------------------------*/

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);
		}
});
if (!window.Event) var Event = { };

Object.extend(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,

		cache: { },

		relatedTarget: function(event) {
				var element;
				switch(event.type) {
						case 'mouseover': element = event.fromElement; break;
						case 'mouseout':  element = event.toElement;   break;
						default: return null;
				}
				return Element.extend(element);
		}
});

Event.Methods = (function() {
		var isButton;

		if (Prototype.Browser.IE) {
				var buttonMap = { 0: 1, 1: 4, 2: 2 };
				isButton = function(event, code) {
						return event.button == buttonMap[code];
				};

		} else if (Prototype.Browser.WebKit) {
				isButton = function(event, code) {
						switch (code) {
								case 0: return event.which == 1 && !event.metaKey;
								case 1: return event.which == 1 && event.metaKey;
								default: return false;
						}
				};

		} else {
				isButton = function(event, code) {
						return event.which ? (event.which === code + 1) : (event.button === code);
				};
		}

		return {
				isLeftClick:   function(event) { return isButton(event, 0) },
				isMiddleClick: function(event) { return isButton(event, 1) },
				isRightClick:  function(event) { return isButton(event, 2) },

				element: function(event) {
						var node = Event.extend(event).target;
						return Element.extend(node.nodeType == Node.TEXT_NODE ? node.parentNode : node);
				},

				findElement: function(event, expression) {
						var element = Event.element(event);
						return element.match(expression) ? element : element.up(expression);
				},

				pointer: function(event) {
						return {
								x: event.pageX || (event.clientX +
										(document.documentElement.scrollLeft || document.body.scrollLeft)),
								y: event.pageY || (event.clientY +
										(document.documentElement.scrollTop || document.body.scrollTop))
						};
				},

				pointerX: function(event) { return Event.pointer(event).x },
				pointerY: function(event) { return Event.pointer(event).y },

				stop: function(event) {
						Event.extend(event);
						event.preventDefault();
						event.stopPropagation();
						event.stopped = true;
				}
		};
})();

Event.extend = (function() {
		var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
				m[name] = Event.Methods[name].methodize();
				return m;
		});

		if (Prototype.Browser.IE) {
				Object.extend(methods, {
						stopPropagation: function() { this.cancelBubble = true },
						preventDefault:  function() { this.returnValue = false },
						inspect: function() { return "[object Event]" }
				});

				return function(event) {
						if (!event) return false;
						if (event._extendedByPrototype) return event;

						event._extendedByPrototype = Prototype.emptyFunction;
						var pointer = Event.pointer(event);
						Object.extend(event, {
								target: event.srcElement,
								relatedTarget: Event.relatedTarget(event),
								pageX:  pointer.x,
								pageY:  pointer.y
						});
						return Object.extend(event, methods);
				};

		} else {
				Event.prototype = Event.prototype || document.createEvent("HTMLEvents").__proto__;
				Object.extend(Event.prototype, methods);
				return Prototype.K;
		}
})();

Object.extend(Event, (function() {
		var cache = Event.cache;

		function getEventID(element) {
				if (element._eventID) return element._eventID;
				arguments.callee.id = arguments.callee.id || 1;
				return element._eventID = ++arguments.callee.id;
		}

		function getDOMEventName(eventName) {
				if (eventName && eventName.include(':')) return "dataavailable";
				return eventName;
		}

		function getCacheForID(id) {
				return cache[id] = cache[id] || { };
		}

		function getWrappersForEventName(id, eventName) {
				var c = getCacheForID(id);
				return c[eventName] = c[eventName] || [];
		}

		function createWrapper(element, eventName, handler) {
				var id = getEventID(element);
				var c = getWrappersForEventName(id, eventName);
				if (c.pluck("handler").include(handler)) return false;

				var wrapper = function(event) {
						if (!Event || !Event.extend ||
								(event.eventName && event.eventName != eventName))
										return false;

						Event.extend(event);
						handler.call(element, event)
				};

				wrapper.handler = handler;
				c.push(wrapper);
				return wrapper;
		}

		function findWrapper(id, eventName, handler) {
				var c = getWrappersForEventName(id, eventName);
				return c.find(function(wrapper) { return wrapper.handler == handler });
		}

		function destroyWrapper(id, eventName, handler) {
				var c = getCacheForID(id);
				if (!c[eventName]) return false;
				c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
		}

		function destroyCache() {
				for (var id in cache)
						for (var eventName in cache[id])
								cache[id][eventName] = null;
		}

		if (window.attachEvent) {
				window.attachEvent("onunload", destroyCache);
		}

		return {
				observe: function(element, eventName, handler) {
						element = $(element);
						var name = getDOMEventName(eventName);

						var wrapper = createWrapper(element, eventName, handler);
						if (!wrapper) return element;

						if (element.addEventListener) {
								element.addEventListener(name, wrapper, false);
						} else {
								element.attachEvent("on" + name, wrapper);
						}

						return element;
				},

				stopObserving: function(element, eventName, handler) {
						element = $(element);
						var id = getEventID(element), name = getDOMEventName(eventName);

						if (!handler && eventName) {
								getWrappersForEventName(id, eventName).each(function(wrapper) {
										element.stopObserving(eventName, wrapper.handler);
								});
								return element;

						} else if (!eventName) {
								Object.keys(getCacheForID(id)).each(function(eventName) {
										element.stopObserving(eventName);
								});
								return element;
						}

						var wrapper = findWrapper(id, eventName, handler);
						if (!wrapper) return element;

						if (element.removeEventListener) {
								element.removeEventListener(name, wrapper, false);
						} else {
								element.detachEvent("on" + name, wrapper);
						}

						destroyWrapper(id, eventName, handler);

						return element;
				},

				fire: function(element, eventName, memo) {
						element = $(element);
						if (element == document && document.createEvent && !element.dispatchEvent)
								element = document.documentElement;

						if (document.createEvent) {
								var event = document.createEvent("HTMLEvents");
								event.initEvent("dataavailable", true, true);
						} else {
								var event = document.createEventObject();
								event.eventType = "ondataavailable";
						}

						event.eventName = eventName;
						event.memo = memo || { };

						if (document.createEvent) {
								element.dispatchEvent(event);
						} else {
								element.fireEvent(event.eventType, event);
						}

						return event;
				}
		};
})());

Object.extend(Event, Event.Methods);

Element.addMethods({
		fire:          Event.fire,
		observe:       Event.observe,
		stopObserving: Event.stopObserving
});

Object.extend(document, {
		fire:          Element.Methods.fire.methodize(),
		observe:       Element.Methods.observe.methodize(),
		stopObserving: Element.Methods.stopObserving.methodize()
});

(function() {
		/* Support for the DOMContentLoaded event is based on work by Dan Webb,
					Matthias Miller, Dean Edwards and John Resig. */

		var timer, fired = false;

		function fireContentLoadedEvent() {
				if (fired) return;
				if (timer) window.clearInterval(timer);
				document.fire("dom:loaded");
				fired = true;
		}

		if (document.addEventListener) {
				if (Prototype.Browser.WebKit) {
						timer = window.setInterval(function() {
								if (/loaded|complete/.test(document.readyState))
										fireContentLoadedEvent();
						}, 0);

						Event.observe(window, "load", fireContentLoadedEvent);

				} else {
						document.addEventListener("DOMContentLoaded",
								fireContentLoadedEvent, false);
				}

		} else {
				document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
				$("__onDOMContentLoaded").onreadystatechange = function() {
						if (this.readyState == "complete") {
								this.onreadystatechange = null;
								fireContentLoadedEvent();
						}
				};
		}
})();
/*------------------------------- DEPRECATED -------------------------------*/

Hash.toQueryString = Object.toQueryString;

var Toggle = { display: Element.toggle };

Element.Methods.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');

// This should be moved to script.aculo.us; notice the deprecated methods
// further below, that map to the newer Element methods.
var Position = {
		// set to true if needed, warning: firefox performance problems
		// NOT neeeded for page scrolling, only if draggable contained in
		// scrollable elements
		includeScrollOffsets: false,

		// must be called before calling withinIncludingScrolloffset, every time the
		// page is scrolled
		prepare: function() {
				this.deltaX =  window.pageXOffset
																|| document.documentElement.scrollLeft
																|| document.body.scrollLeft
																|| 0;
				this.deltaY =  window.pageYOffset
																|| document.documentElement.scrollTop
																|| document.body.scrollTop
																|| 0;
		},

		// caches x/y coordinate pair to use with overlap
		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);
		},

		// within must be called directly before
		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;
		},

		// Deprecation layer -- use newer Element methods now (1.5.2).

		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) {
				this.element.className.split(/\s+/).select(function(name) {
						return name.length > 0;
				})._each(iterator);
		},

		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);

/*--------------------------------------------------------------------------*/

Element.addMethods();