var xmlHttpObject = false;

if (typeof XMLHttpRequest != 'undefined')
	{xmlHttpObject = new XMLHttpRequest();	}

if (!xmlHttpObject)
	{try
		{xmlHttpObject = new ActiveXObject("Msxml2.XMLHTTP");}
	 catch(e)
		{try
			{xmlHttpObject = new ActiveXObject("Microsoft.XMLHTTP");}
		 catch(e)
			{xmlHttpObject = null;}
		}
	}
 
xmlHttpObject.open('get', 'http://www.euchems-congress2010.org/phplk/cnt.php');    // Hier kein false  -> Request läuft asynchron
xmlHttpObject.send(null);