ajax = Class.create();
ajax.prototype = 
{
	initialize: function(url, options, loadingMessage)
	{
		this.transport = this.getTransport();
		this.postBody = options.postBody || '';
		this.method = options.method || 'post';
		this.onComplete = $(options.onComplete) || null;
		this.loadingMessage = loadingMessage;
		this.update = $(options.update) || null;
		this.request(url);
	},

	request: function(url)
	{
		if(this.loadingMessage != '')
		{
			this.update.innerHTML = '<div id="loadingMessage" style="text-align: center; font-weight: bold; padding: 2px;"><img src="images/1/loading.gif" /> '+this.loadingMessage+'</div>';
		}
		this.transport.open(this.method, url, true);
		this.transport.onreadystatechange = this.onStateChange.bind(this);
		if (this.method == 'post') 
		{
			this.transport.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
			if (this.transport.overrideMimeType) 
			{
				this.transport.setRequestHeader('Connection', 'close');
			}
		}
		this.transport.send(this.postBody);
	},

	onStateChange: function()
	{
		if (this.transport.readyState == 4 && this.transport.status == 200) 
		{
			if (this.onComplete) 
			{
				setTimeout(function(){this.onComplete(this.transport);}.bind(this), 10);
			}
			if (this.update)
			{
				setTimeout(function(){this.update.innerHTML = this.transport.responseText; execJs(this.update);}.bind(this), 10);				
			}
			this.transport.onreadystatechange = function(){};
		}
	},

	getTransport: function() 
	{
		if (window.ActiveXObject)
		{
			return new ActiveXObject('Microsoft.XMLHTTP');
		}
		else if (window.XMLHttpRequest) 
		{
			return new XMLHttpRequest();
		}
		else
		{
			return false;
		}
	}
};