/*	Prototype JavaScript framework, version 1.5.0
*	(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://prototype.conio.net/
*
/*--------------------------------------------------------------------------*/

var Prototype = {
Version: '1.5.0',
BrowserFeatures: {
 XPath: !!document.evaluate
},

ScriptFragment: '(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)',
emptyFunction: function() {},
K: function(x) { return x }
}

var Class = {
create: function() {
 return function() {
	this.initialize.apply(this, arguments);
 }
}
}

var Abstract = new Object();

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;
 }
},

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);
}
});

Function.prototype.bind = function() {
var __method = this, args = $A(arguments), object = args.shift();
return function() {
 return __method.apply(object, args.concat($A(arguments)));
}
}

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

Object.extend(Number.prototype, {
toColorPart: function() {
 var digits = this.toString(16);
 if (this < 16) return '0' + digits;
 return digits;
},

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

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

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

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

 return returnValue;
}
}

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

var PeriodicalExecuter = Class.create();
PeriodicalExecuter.prototype = {
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);
},

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

onTimerEvent: function() {
 if (!this.currentlyExecuting) {
	try {
		this.currentlyExecuting = true;
		this.callback(this);
	} finally {
		this.currentlyExecuting = false;
	}
 }
}
}
String.interpret = function(value){
return value == null ? '' : String(value);
}

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 this;
},

truncate: function(length, truncation) {
 length = length || 30;
 truncation = truncation === undefined ? '...' : truncation;
 return this.length > length ?
	this.slice(0, length - truncation.length) + truncation : 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 div = document.createElement('div');
 var text = document.createTextNode(this);
 div.appendChild(text);
 return div.innerHTML;
},

unescapeHTML: function() {
 var div = document.createElement('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 name = decodeURIComponent(pair[0]);
		var value = pair[1] ? decodeURIComponent(pair[1]) : undefined;

		if (hash[name] !== undefined) {
		 if (hash[name].constructor != Array)
			hash[name] = [hash[name]];
		 if (value) hash[name].push(value);
		}
		else hash[name] = 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);
},

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.replace(/\\/g, '\\\\');
 if (useDoubleQuotes)
	return '"' + escapedString.replace(/"/g, '\\"') + '"';
 else
	return "'" + escapedString.replace(/'/g, '\\\'') + "'";
}
});

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

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

var Template = Class.create();
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
Template.prototype = {
initialize: function(template, pattern) {
 this.template = template.toString();
 this.pattern	= pattern || Template.Pattern;
},

evaluate: function(object) {
 return this.template.gsub(this.pattern, function(match) {
	var before = match[1];
	if (before == '\\') return match[2];
	return before + String.interpret(object[match[3]]);
 });
}
}

var $break	 = new Object();
var $continue = new Object();

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

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

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

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

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

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

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

grep: function(pattern, iterator) {
 var results = [];
 this.each(function(value, index) {
	var stringValue = value.toString();
	if (stringValue.match(pattern))
		results.push((iterator || Prototype.K)(value, index));
 })
 return results;
},

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

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

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

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

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

sortBy: function(iterator) {
 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 (typeof args.last() == 'function')
	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,
member:	Enumerable.include,
entries: Enumerable.toArray
});
var $A = Array.from = function(iterable) {
if (!iterable) return [];
if (iterable.toArray) {
 return iterable.toArray();
} else {
 var results = [];
 for (var i = 0, length = iterable.length; i < length; i++)
	results.push(iterable[i]);
 return results;
}
}

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(value && value.constructor == Array ?
		value.flatten() : [value]);
 });
},

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

indexOf: function(object) {
 for (var i = 0, length = this.length; i < length; i++)
	if (this[i] == object) return i;
 return -1;
},

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

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

uniq: function() {
 return this.inject([], function(array, value) {
	return array.include(value) ? array : array.concat([value]);
 });
},

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

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

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

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

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

if(window.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(arguments[i].constructor == Array) {
		for(var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
		 array.push(arguments[i][j]);
	} else {
		array.push(arguments[i]);
	}
 }
 return array;
}
}
var Hash = function(obj) {
Object.extend(this, obj || {});
};

Object.extend(Hash, {
toQueryString: function(obj) {
 var parts = [];

	this.prototype._each.call(obj, function(pair) {
	if (!pair.key) return;

	if (pair.value && pair.value.constructor == Array) {
		var values = pair.value.compact();
		if (values.length < 2) pair.value = values.reduce();
		else {
			key = encodeURIComponent(pair.key);
		 values.each(function(value) {
			value = value != undefined ? encodeURIComponent(value) : '';
			parts.push(key + '=' + encodeURIComponent(value));
		 });
		 return;
		}
	}
	if (pair.value == undefined) pair[1] = '';
	parts.push(pair.map(encodeURIComponent).join('='));
	});

 return parts.join('&');
}
});

Object.extend(Hash.prototype, Enumerable);
Object.extend(Hash.prototype, {
_each: function(iterator) {
 for (var key in this) {
	var value = this[key];
	if (value && value == Hash.prototype[key]) continue;

	var pair = [key, value];
	pair.key = key;
	pair.value = value;
	iterator(pair);
 }
},

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

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

merge: function(hash) {
 return $H(hash).inject(this, function(mergedHash, pair) {
	mergedHash[pair.key] = pair.value;
	return mergedHash;
 });
},

remove: function() {
 var result;
 for(var i = 0, length = arguments.length; i < length; i++) {
	var value = this[arguments[i]];
	if (value !== undefined){
		if (result === undefined) result = value;
		else {
		 if (result.constructor != Array) result = [result];
		 result.push(value)
		}
	}
	delete this[arguments[i]];
 }
 return result;
},

toQueryString: function() {
 return Hash.toQueryString(this);
},

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

function $H(object) {
if (object && object.constructor == Hash) return object;
return new Hash(object);
};
ObjectRange = Class.create();
Object.extend(ObjectRange.prototype, Enumerable);
Object.extend(ObjectRange.prototype, {
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 (typeof responder[callback] == 'function') {
		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 = function() {};
Ajax.Base.prototype = {
setOptions: function(options) {
 this.options = {
	method:		 'post',
	asynchronous: true,
	contentType:	'application/x-www-form-urlencoded',
	encoding:		'UTF-8',
	parameters:	''
 }
 Object.extend(this.options, options || {});

 this.options.method = this.options.method.toLowerCase();
 if (typeof this.options.parameters == 'string')
	this.options.parameters = this.options.parameters.toQueryParams();
}
}

Ajax.Request = Class.create();
Ajax.Request.Events =
['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
_complete: false,

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

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

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

 params = Hash.toQueryString(params);
 if (params && /Konqueror|Safari|KHTML/.test(navigator.userAgent)) params += '&_='

 // when GET, append parameters to URL
 if (this.method == 'get' && params)
	this.url += (this.url.indexOf('?') > -1 ? '&' : '?') + params;

 try {
	Ajax.Responders.dispatch('onCreate', this, this.transport);

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

	if (this.options.asynchronous)
		setTimeout(function() { this.respondToReadyState(1) }.bind(this), 10);

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

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

	this.transport.send(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 (typeof extras.push == 'function')
		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() {
 return !this.transport.status
		|| (this.transport.status >= 200 && this.transport.status < 300);
},

respondToReadyState: function(readyState) {
 var state = Ajax.Request.Events[readyState];
 var transport = this.transport, json = this.evalJSON();

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

	if ((this.getHeader('Content-type') || 'text/javascript').strip().
		match(/^(text|application)\/(x-)?(java|ecma)script(;.*)?$/i))
		 this.evalResponse();
 }

 try {
	(this.options['on' + state] || Prototype.emptyFunction)(transport, json);
	Ajax.Responders.dispatch('on' + state, this, transport, json);
 } 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 }
},

evalJSON: function() {
 try {
	var json = this.getHeader('X-JSON');
	return json ? eval('(' + json + ')') : null;
 } catch (e) { return null }
},

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

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

Ajax.Updater = Class.create();

Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
initialize: function(container, url, options) {
 this.container = {
	success: (container.success || container),
	failure: (container.failure || (container.success ? null : container))
 }

 this.transport = Ajax.getTransport();
 this.setOptions(options);

 var onComplete = this.options.onComplete || Prototype.emptyFunction;
 this.options.onComplete = (function(transport, param) {
	this.updateContent();
	onComplete(transport, param);
 }).bind(this);

 this.request(url);
},

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

 if (!this.options.evalScripts) response = response.stripScripts();

 if (receiver = $(receiver)) {
	if (this.options.insertion)
		new this.options.insertion(receiver, response);
	else
		receiver.update(response);
 }

 if (this.success()) {
	if (this.onComplete)
		setTimeout(this.onComplete.bind(this), 10);
 }
}
});

Ajax.PeriodicalUpdater = Class.create();
Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
initialize: function(container, url, options) {
 this.setOptions(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(request) {
 if (this.options.decay) {
	this.decay = (request.responseText == this.lastText ?
		this.decay * this.options.decay : 1);

	this.lastText = request.responseText;
 }
 this.timer = setTimeout(this.onTimerEvent.bind(this),
	this.decay * this.frequency * 1000);
},

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 (typeof element == 'string')
 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(query.snapshotItem(i));
 return results;
};
}

document.getElementsByClassName = function(className, parentElement) {
if (Prototype.BrowserFeatures.XPath) {
 var q = ".//*[contains(concat(' ', @class, ' '), ' " + className + " ')]";
 return document._getElementsByXPath(q, parentElement);
} else {
 var children = ($(parentElement) || document.body).getElementsByTagName('*');
 var elements = [], child;
 for (var i = 0, length = children.length; i < length; i++) {
	child = children[i];
	if (Element.hasClassName(child, className))
		elements.push(Element.extend(child));
 }
 return elements;
}
};

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

if (!window.Element)
var Element = new Object();

Element.extend = function(element) {
if (!element || _nativeExtensions || element.nodeType == 3) return element;

if (!element._extended && element.tagName && element != window) {
 var methods = Object.clone(Element.Methods), cache = Element.extend.cache;

 if (element.tagName == 'FORM')
	Object.extend(methods, Form.Methods);
 if (['INPUT', 'TEXTAREA', 'SELECT'].include(element.tagName))
	Object.extend(methods, Form.Element.Methods);

 Object.extend(methods, Element.Methods.Simulated);

 for (var property in methods) {
	var value = methods[property];
	if (typeof value == 'function' && !(property in element))
		element[property] = cache.findOrStore(value);
 }
}

element._extended = true;
return element;
};

Element.extend.cache = {
findOrStore: function(value) {
 return this[value] = this[value] || function() {
	return value.apply(null, [this].concat($A(arguments)));
 }
}
};

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, html) {
 html = typeof html == 'undefined' ? '' : html.toString();
 $(element).innerHTML = html.stripScripts();
 setTimeout(function() {html.evalScripts()}, 10);
 return element;
},

replace: function(element, html) {
 element = $(element);
 html = typeof html == 'undefined' ? '' : html.toString();
 if (element.outerHTML) {
	element.outerHTML = html.stripScripts();
 } else {
	var range = element.ownerDocument.createRange();
	range.selectNodeContents(element);
	element.parentNode.replaceChild(
		range.createContextualFragment(html.stripScripts()), element);
 }
 setTimeout(function() {html.evalScripts()}, 10);
 return element;
},

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('*'));
},

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 (typeof selector == 'string')
	selector = new Selector(selector);
 return selector.match($(element));
},

up: function(element, expression, index) {
 return Selector.findElement($(element).ancestors(), expression, index);
},

down: function(element, expression, index) {
 return Selector.findElement($(element).descendants(), expression, index);
},

previous: function(element, expression, index) {
 return Selector.findElement($(element).previousSiblings(), expression, index);
},

next: function(element, expression, index) {
 return Selector.findElement($(element).nextSiblings(), expression, index);
},

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

getElementsByClassName: function(element, className) {
 return document.getElementsByClassName(className, element);
},

readAttribute: function(element, name) {
 element = $(element);
 if (document.all && !window.opera) {
	var t = Element._attributeTranslations;
	if (t.values[name]) return t.values[name](element, name);
	if (t.names[name])	name = t.names[name];
	var attribute = element.attributes[name];
	if(attribute) return attribute.nodeValue;
 }
 return element.getAttribute(name);
},

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 = $(element))) return;
 var elementClassName = element.className;
 if (elementClassName.length == 0) return false;
 if (elementClassName == className ||
		elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
	return true;
 return false;
},

addClassName: function(element, className) {
 if (!(element = $(element))) return;
 Element.classNames(element).add(className);
 return element;
},

removeClassName: function(element, className) {
 if (!(element = $(element))) return;
 Element.classNames(element).remove(className);
 return element;
},

toggleClassName: function(element, className) {
 if (!(element = $(element))) return;
 Element.classNames(element)[element.hasClassName(className) ? 'remove' : 'add'](className);
 return element;
},

observe: function() {
 Event.observe.apply(Event, arguments);
 return $A(arguments).first();
},

stopObserving: function() {
 Event.stopObserving.apply(Event, arguments);
 return $A(arguments).first();
},

// 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 $(element).innerHTML.match(/^\s*$/);
},

descendantOf: function(element, ancestor) {
 element = $(element), ancestor = $(ancestor);
 while (element = element.parentNode)
	if (element == ancestor) return true;
 return false;
},

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

getStyle: function(element, style) {
 element = $(element);
 if (['float','cssFloat'].include(style))
	style = (typeof element.style.styleFloat != 'undefined' ? 'styleFloat' : 'cssFloat');
 style = style.camelize();
 var value = element.style[style];
 if (!value) {
	if (document.defaultView && document.defaultView.getComputedStyle) {
		var css = document.defaultView.getComputedStyle(element, null);
		value = css ? css[style] : null;
	} else if (element.currentStyle) {
		value = element.currentStyle[style];
	}
 }

 if((value == 'auto') && ['width','height'].include(style) && (element.getStyle('display') != 'none'))
	value = element['offset'+style.capitalize()] + 'px';

 if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))
	if (Element.getStyle(element, 'position') == 'static') value = 'auto';
 if(style == 'opacity') {
	if(value) return parseFloat(value);
	if(value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
		if(value[1]) return parseFloat(value[1]) / 100;
	return 1.0;
 }
 return value == 'auto' ? null : value;
},

setStyle: function(element, style) {
 element = $(element);
 for (var name in style) {
	var value = style[name];
	if(name == 'opacity') {
		if (value == 1) {
		 value = (/Gecko/.test(navigator.userAgent) &&
			!/Konqueror|Safari|KHTML/.test(navigator.userAgent)) ? 0.999999 : 1.0;
		 if(/MSIE/.test(navigator.userAgent) && !window.opera)
			element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'');
		} else if(value == '') {
		 if(/MSIE/.test(navigator.userAgent) && !window.opera)
			element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'');
		} else {
		 if(value < 0.00001) value = 0;
		 if(/MSIE/.test(navigator.userAgent) && !window.opera)
			element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'') +
				'alpha(opacity='+value*100+')';
		}
	} else if(['float','cssFloat'].include(name)) name = (typeof element.style.styleFloat != 'undefined') ? 'styleFloat' : 'cssFloat';
	element.style[name.camelize()] = 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.style.overflow || 'auto';
 if ((Element.getStyle(element, 'overflow') || 'visible') != '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;
}
};

Object.extend(Element.Methods, {childOf: Element.Methods.descendantOf});

Element._attributeTranslations = {};

Element._attributeTranslations.names = {
colspan:	"colSpan",
rowspan:	"rowSpan",
valign:	 "vAlign",
datetime:	"dateTime",
accesskey: "accessKey",
tabindex:	"tabIndex",
enctype:	"encType",
maxlength: "maxLength",
readonly:	"readOnly",
longdesc:	"longDesc"
};

Element._attributeTranslations.values = {
_getAttr: function(element, attribute) {
 return element.getAttribute(attribute, 2);
},

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

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

title: function(element) {
 var node = element.getAttributeNode('title');
 return node.specified ? node.nodeValue : null;
}
};

Object.extend(Element._attributeTranslations.values, {
href: Element._attributeTranslations.values._getAttr,
src:	Element._attributeTranslations.values._getAttr,
disabled: Element._attributeTranslations.values._flag,
checked:	Element._attributeTranslations.values._flag,
readonly: Element._attributeTranslations.values._flag,
multiple: Element._attributeTranslations.values._flag
});

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

// IE is missing .innerHTML support for TABLE-related elements
if (document.all && !window.opera){
Element.Methods.update = function(element, html) {
 element = $(element);
 html = typeof html == 'undefined' ? '' : html.toString();
 var tagName = element.tagName.toUpperCase();
 if (['THEAD','TBODY','TR','TD'].include(tagName)) {
	var div = document.createElement('div');
	switch (tagName) {
		case 'THEAD':
		case 'TBODY':
		 div.innerHTML = '<table><tbody>' +	html.stripScripts() + '</tbody></table>';
		 depth = 2;
		 break;
		case 'TR':
		 div.innerHTML = '<table><tbody><tr>' +	html.stripScripts() + '</tr></tbody></table>';
		 depth = 3;
		 break;
		case 'TD':
		 div.innerHTML = '<table><tbody><tr><td>' +	html.stripScripts() + '</td></tr></tbody></table>';
		 depth = 4;
	}
	$A(element.childNodes).each(function(node){
		element.removeChild(node)
	});
	depth.times(function(){ div = div.firstChild });

	$A(div.childNodes).each(
		function(node){ element.appendChild(node) });
 } else {
	element.innerHTML = html.stripScripts();
 }
 setTimeout(function() {html.evalScripts()}, 10);
 return element;
}
};

Object.extend(Element, Element.Methods);

var _nativeExtensions = false;

if(/Konqueror|Safari|KHTML/.test(navigator.userAgent))
['', 'Form', 'Input', 'TextArea', 'Select'].each(function(tag) {
 var className = 'HTML' + tag + 'Element';
 if(window[className]) return;
 var klass = window[className] = {};
 klass.prototype = document.createElement(tag ? tag.toLowerCase() : 'div').__proto__;
});

Element.addMethods = function(methods) {
Object.extend(Element.Methods, methods || {});

function copy(methods, destination, onlyIfAbsent) {
 onlyIfAbsent = onlyIfAbsent || false;
 var cache = Element.extend.cache;
 for (var property in methods) {
	var value = methods[property];
	if (!onlyIfAbsent || !(property in destination))
		destination[property] = cache.findOrStore(value);
 }
}

if (typeof HTMLElement != 'undefined') {
 copy(Element.Methods, HTMLElement.prototype);
 copy(Element.Methods.Simulated, HTMLElement.prototype, true);
 copy(Form.Methods, HTMLFormElement.prototype);
 [HTMLInputElement, HTMLTextAreaElement, HTMLSelectElement].each(function(klass) {
	copy(Form.Element.Methods, klass.prototype);
 });
 _nativeExtensions = true;
}
}

var Toggle = new Object();
Toggle.display = Element.toggle;

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

Abstract.Insertion = function(adjacency) {
this.adjacency = adjacency;
}

Abstract.Insertion.prototype = {
initialize: function(element, content) {
 this.element = $(element);
 this.content = content.stripScripts();

 if (this.adjacency && this.element.insertAdjacentHTML) {
	try {
		this.element.insertAdjacentHTML(this.adjacency, this.content);
	} catch (e) {
		var tagName = this.element.tagName.toUpperCase();
		if (['TBODY', 'TR'].include(tagName)) {
		 this.insertContent(this.contentFromAnonymousTable());
		} else {
		 throw e;
		}
	}
 } else {
	this.range = this.element.ownerDocument.createRange();
	if (this.initializeRange) this.initializeRange();
	this.insertContent([this.range.createContextualFragment(this.content)]);
 }

 setTimeout(function() {content.evalScripts()}, 10);
},

contentFromAnonymousTable: function() {
 var div = document.createElement('div');
 div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
 return $A(div.childNodes[0].childNodes[0].childNodes);
}
}

var Insertion = new Object();

Insertion.Before = Class.create();
Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
initializeRange: function() {
 this.range.setStartBefore(this.element);
},

insertContent: function(fragments) {
 fragments.each((function(fragment) {
	this.element.parentNode.insertBefore(fragment, this.element);
 }).bind(this));
}
});

Insertion.Top = Class.create();
Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {
initializeRange: function() {
 this.range.selectNodeContents(this.element);
 this.range.collapse(true);
},

insertContent: function(fragments) {
 fragments.reverse(false).each((function(fragment) {
	this.element.insertBefore(fragment, this.element.firstChild);
 }).bind(this));
}
});

Insertion.Bottom = Class.create();
Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {
initializeRange: function() {
 this.range.selectNodeContents(this.element);
 this.range.collapse(this.element);
},

insertContent: function(fragments) {
 fragments.each((function(fragment) {
	this.element.appendChild(fragment);
 }).bind(this));
}
});

Insertion.After = Class.create();
Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
initializeRange: function() {
 this.range.setStartAfter(this.element);
},

insertContent: function(fragments) {
 fragments.each((function(fragment) {
	this.element.parentNode.insertBefore(fragment,
		this.element.nextSibling);
 }).bind(this));
}
});

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

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);
var Selector = Class.create();
Selector.prototype = {
initialize: function(expression) {
 this.params = {classNames: []};
 this.expression = expression.toString().strip();
 this.parseExpression();
 this.compileMatcher();
},

parseExpression: function() {
 function abort(message) { throw 'Parse error in selector: ' + message; }

 if (this.expression == '')	abort('empty expression');

 var params = this.params, expr = this.expression, match, modifier, clause, rest;
 while (match = expr.match(/^(.*)\[([a-z0-9_:-]+?)(?:([~\|!]?=)(?:"([^"]*)"|([^\]\s]*)))?\]$/i)) {
	params.attributes = params.attributes || [];
	params.attributes.push({name: match[2], operator: match[3], value: match[4] || match[5] || ''});
	expr = match[1];
 }

 if (expr == '*') return this.params.wildcard = true;

 while (match = expr.match(/^([^a-z0-9_-])?([a-z0-9_-]+)(.*)/i)) {
	modifier = match[1], clause = match[2], rest = match[3];
	switch (modifier) {
		case '#':		 params.id = clause; break;
		case '.':		 params.classNames.push(clause); break;
		case '':
		case undefined: params.tagName = clause.toUpperCase(); break;
		default:			abort(expr.inspect());
	}
	expr = rest;
 }

 if (expr.length > 0) abort(expr.inspect());
},

buildMatchExpression: function() {
 var params = this.params, conditions = [], clause;

 if (params.wildcard)
	conditions.push('true');
 if (clause = params.id)
	conditions.push('element.readAttribute("id") == ' + clause.inspect());
 if (clause = params.tagName)
	conditions.push('element.tagName.toUpperCase() == ' + clause.inspect());
 if ((clause = params.classNames).length > 0)
	for (var i = 0, length = clause.length; i < length; i++)
		conditions.push('element.hasClassName(' + clause[i].inspect() + ')');
 if (clause = params.attributes) {
	clause.each(function(attribute) {
		var value = 'element.readAttribute(' + attribute.name.inspect() + ')';
		var splitValueBy = function(delimiter) {
		 return value + ' && ' + value + '.split(' + delimiter.inspect() + ')';
		}

		switch (attribute.operator) {
		 case '=':		 conditions.push(value + ' == ' + attribute.value.inspect()); break;
		 case '~=':		conditions.push(splitValueBy(' ') + '.include(' + attribute.value.inspect() + ')'); break;
		 case '|=':		conditions.push(
								 splitValueBy('-') + '.first().toUpperCase() == ' + attribute.value.toUpperCase().inspect()
								); break;
		 case '!=':		conditions.push(value + ' != ' + attribute.value.inspect()); break;
		 case '':
		 case undefined: conditions.push('element.hasAttribute(' + attribute.name.inspect() + ')'); break;
		 default:			throw 'Unknown operator ' + attribute.operator + ' in selector';
		}
	});
 }

 return conditions.join(' && ');
},

compileMatcher: function() {
 this.match = new Function('element', 'if (!element.tagName) return false; \
	element = $(element); \
	return ' + this.buildMatchExpression());
},

findElements: function(scope) {
 var element;

 if (element = $(this.params.id))
	if (this.match(element))
		if (!scope || Element.childOf(element, scope))
		 return [element];

 scope = (scope || document).getElementsByTagName(this.params.tagName || '*');

 var results = [];
 for (var i = 0, length = scope.length; i < length; i++)
	if (this.match(element = scope[i]))
		results.push(Element.extend(element));

 return results;
},

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

Object.extend(Selector, {
matchElements: function(elements, expression) {
 var selector = new Selector(expression);
 return elements.select(selector.match.bind(selector)).map(Element.extend);
},

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

findChildElements: function(element, expressions) {
 return expressions.map(function(expression) {
	return expression.match(/[^\s"]+(?:"[^"]*"[^\s"]+)*/g).inject([null], function(results, expr) {
		var selector = new Selector(expr);
		return results.inject([], function(elements, result) {
		 return elements.concat(selector.findElements(result || element));
		});
	});
 }).flatten();
}
});

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

serializeElements: function(elements, getHash) {
 var data = elements.inject({}, function(result, element) {
	if (!element.disabled && element.name) {
		var key = element.name, value = $(element).getValue();
		if (value != undefined) {
		 if (result[key]) {
			if (result[key].constructor != Array) result[key] = [result[key]];
			result[key].push(value);
		 }
		 else result[key] = value;
		}
	}
	return result;
 });

 return getHash ? data : Hash.toQueryString(data);
}
};

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

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().each(function(element) {
	element.blur();
	element.disabled = 'true';
 });
 return form;
},

enable: function(form) {
 form = $(form);
 form.getElements().each(function(element) {
	element.disabled = '';
 });
 return form;
},

findFirstElement: function(form) {
 return $(form).getElements().find(function(element) {
	return element.type != 'hidden' && !element.disabled &&
		['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
 });
},

focusFirstElement: function(form) {
 form = $(form);
 form.findFirstElement().activate();
 return form;
}
}

Object.extend(Form, Form.Methods);

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

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 Hash.toQueryString(pair);
	}
 }
 return '';
},

getValue: function(element) {
 element = $(element);
 var method = element.tagName.toLowerCase();
 return Form.Element.Serializers[method](element);
},

clear: function(element) {
 $(element).value = '';
 return element;
},

present: function(element) {
 return $(element).value != '';
},

activate: function(element) {
 element = $(element);
 element.focus();
 if (element.select && ( element.tagName.toLowerCase() != 'input' ||
	!['button', 'reset', 'submit'].include(element.type) ) )
	element.select();
 return element;
},

disable: function(element) {
 element = $(element);
 element.disabled = true;
 return element;
},

enable: function(element) {
 element = $(element);
 element.blur();
 element.disabled = false;
 return element;
}
}

Object.extend(Form.Element, Form.Element.Methods);
var Field = Form.Element;
var $F = Form.Element.getValue;

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

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

inputSelector: function(element) {
 return element.checked ? element.value : null;
},

textarea: function(element) {
 return element.value;
},

select: function(element) {
 return this[element.type == 'select-one' ?
	'selectOne' : 'selectMany'](element);
},

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 = function() {}
Abstract.TimedObserver.prototype = {
initialize: function(element, frequency, callback) {
 this.frequency = frequency;
 this.element	= $(element);
 this.callback	= callback;

 this.lastValue = this.getValue();
 this.registerCallback();
},

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

onTimerEvent: function() {
 var value = this.getValue();
 var changed = ('string' == typeof this.lastValue && 'string' == typeof value
	? this.lastValue != value : String(this.lastValue) != String(value));
 if (changed) {
	this.callback(this.element, value);
	this.lastValue = value;
 }
}
}

Form.Element.Observer = Class.create();
Form.Element.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
getValue: function() {
 return Form.Element.getValue(this.element);
}
});

Form.Observer = Class.create();
Form.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
getValue: function() {
 return Form.serialize(this.element);
}
});

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

Abstract.EventObserver = function() {}
Abstract.EventObserver.prototype = {
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.bind(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();
Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
getValue: function() {
 return Form.Element.getValue(this.element);
}
});

Form.EventObserver = Class.create();
Form.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
getValue: function() {
 return Form.serialize(this.element);
}
});
if (!window.Event) {
var Event = new Object();
}

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,

element: function(event) {
 return event.target || event.srcElement;
},

isLeftClick: function(event) {
 return (((event.which) && (event.which == 1)) ||
			((event.button) && (event.button == 1)));
},

pointerX: function(event) {
 return event.pageX || (event.clientX +
	(document.documentElement.scrollLeft || document.body.scrollLeft));
},

pointerY: function(event) {
 return event.pageY || (event.clientY +
	(document.documentElement.scrollTop || document.body.scrollTop));
},

stop: function(event) {
 if (event.preventDefault) {
	event.preventDefault();
	event.stopPropagation();
 } else {
	event.returnValue = false;
	event.cancelBubble = true;
 }
},

// find the first node with the given tagName, starting from the
// node the event was triggered on; traverses the DOM upwards
findElement: function(event, tagName) {
 var element = Event.element(event);
 while (element.parentNode && (!element.tagName ||
		(element.tagName.toUpperCase() != tagName.toUpperCase())))
	element = element.parentNode;
 return element;
},

observers: false,

_observeAndCache: function(element, name, observer, useCapture) {
 if (!this.observers) this.observers = [];
 if (element.addEventListener) {
	this.observers.push([element, name, observer, useCapture]);
	element.addEventListener(name, observer, useCapture);
 } else if (element.attachEvent) {
	this.observers.push([element, name, observer, useCapture]);
	element.attachEvent('on' + name, observer);
 }
},

unloadCache: function() {
 if (!Event.observers) return;
 for (var i = 0, length = Event.observers.length; i < length; i++) {
	Event.stopObserving.apply(this, Event.observers[i]);
	Event.observers[i][0] = null;
 }
 Event.observers = false;
},

observe: function(element, name, observer, useCapture) {
 element = $(element);
 useCapture = useCapture || false;

 if (name == 'keypress' &&
		(navigator.appVersion.match(/Konqueror|Safari|KHTML/)
		|| element.attachEvent))
	name = 'keydown';

 Event._observeAndCache(element, name, observer, useCapture);
},

stopObserving: function(element, name, observer, useCapture) {
 element = $(element);
 useCapture = useCapture || false;

 if (name == 'keypress' &&
		(navigator.appVersion.match(/Konqueror|Safari|KHTML/)
		|| element.detachEvent))
	name = 'keydown';

 if (element.removeEventListener) {
	element.removeEventListener(name, observer, useCapture);
 } else if (element.detachEvent) {
	try {
		element.detachEvent('on' + name, observer);
	} catch (e) {}
 }
}
});

/* prevent memory leaks in IE */
if (navigator.appVersion.match(/\bMSIE\b/))
Event.observe(window, 'unload', Event.unloadCache, false);
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;
},

realOffset: function(element) {
 var valueT = 0, valueL = 0;
 do {
	valueT += element.scrollTop	|| 0;
	valueL += element.scrollLeft || 0;
	element = element.parentNode;
 } while (element);
 return [valueL, valueT];
},

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

offsetParent: 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;
},

// 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 = this.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 = this.realOffset(element);

 this.xcomp = x + offsetcache[0] - this.deltaX;
 this.ycomp = y + offsetcache[1] - this.deltaY;
 this.offset = this.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;
},

page: 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)
		if (Element.getStyle(element,'position')=='absolute') break;

 } while (element = element.offsetParent);

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

 return [valueL, valueT];
},

clone: function(source, target) {
 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 = Position.page(source);

 // find coordinate system to use
 target = $(target);
 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(target,'position') == 'absolute') {
	parent = Position.offsetParent(target);
	delta = Position.page(parent);
 }

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

absolutize: function(element) {
 element = $(element);
 if (element.style.position == 'absolute') return;
 Position.prepare();

 var offsets = Position.positionedOffset(element);
 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';
},

relativize: function(element) {
 element = $(element);
 if (element.style.position == 'relative') return;
 Position.prepare();

 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;
}
}

// Safari returns margins on body which is incorrect if the child is absolutely
// positioned.	For performance reasons, redefine Position.cumulativeOffset for
// KHTML/WebKit only.
if (/Konqueror|Safari|KHTML/.test(navigator.userAgent)) {
Position.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 [valueL, valueT];
}
}

Element.addMethods();