function Ajax()
{
	this.url = "";
	this.params = "";
	this.method = "GET";
	this.onSuccess = null;
	this.onError = function(msg)
	{
		alert(msg)
	}
}

Ajax.prototype.doRequest = function()
{
	if(!this.url)
	{
		this.onError("Es wurde kein URL angegeben. Der Request wird abgebrochen.");
		return false;
	}
	
	if (!this.method)
	{
		this.method = "GET";
	} 
	else 
	{
		this.method = this.method.toUpperCase();
	}
	
	var xmlHttpRequest=getXMLHttpRequest();
	if(!xmlHttpRequest)
	{
		this.onError("Es konnte kein XMLHttpRequest-Objekt erstellt werden.");
		return false;
	}
	
	var _this = this;
	
	switch (this.method) 
	{
		case "GET"	:	xmlHttpRequest.open(this.method, this.url+"?"+this.params, true);
						xmlHttpRequest.onreadystatechange = readyStateHandler;
						xmlHttpRequest.send(null);
						break;
		
		case "POST"	: 	xmlHttpRequest.open(this.method, this.url, true);
						xmlHttpRequest.onreadystatechange = readyStateHandler;
						xmlHttpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
						xmlHttpRequest.send(this.params);
						break;
	}
	
	function readyStateHandler()
	{
		if (xmlHttpRequest.readyState < 4)
		{
			return false;
		}
		if (xmlHttpRequest.status == 200 || xmlHttpRequest.status == 304)
		{
			if (_this.onSuccess)
			{		
				_this.onSuccess(xmlHttpRequest.responseText, xmlHttpRequest.responseXML);
			}
		} 
		else
		{
			if (_this.onError)
			{
				_this.onError("["+xmlHttpRequest.status+" "+xmlHttpRequest.statusText+"] Es trat ein Fehler bei der Datenuebertragung auf.");
			}
		}
	}
}

function getXMLHttpRequest()
{
	if (window.XMLHttpRequest)
	{
		return new XMLHttpRequest();
	}
	else if(window.ActiveXObject)
	{
		try
		{
			return new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch(e)
		{
			try
			{
				return new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e)
			{
				return null;
			}
		}
	}
	
	return null;
}