var xmlhttp = GetXmlHttpObject();

function getRes(site)
{	
	if(!xmlhttp)
		return;
	
	var res = (screen.width + "x" + screen.height);
	var url = "../tracker/res_catch.php?res=" + res + "&site=" + site;
	url +="&sid=" + Math.random();
	
	xmlhttp.open("GET", url, true);
	xmlhttp.send(null);
}

function GetXmlHttpObject()
{
	if (window.XMLHttpRequest)
		return new XMLHttpRequest();

	if (window.ActiveXObject)
		return new ActiveXObject("Microsoft.XMLHTTP");

	return null;
}