function getXMLHttpRequest()
{
	var ua = navigator.userAgent.toLowerCase();
   	
	if (!window.ActiveXObject)
	{
     	req = new XMLHttpRequest();
	}
   	else if (ua.indexOf('msie 5') == -1)
	{
     	req = new ActiveXObject("Msxml2.XMLHTTP");
	} else {
     	req = new ActiveXObject("Microsoft.XMLHTTP");
	}
	
	return req;
}