function insert_track(pagename) { 
	referer = document.referrer;
	xmlHttp=GetXmlHttpObject_tracking();
	if (xmlHttp==null) {
		alert ("Browser does not support HTTP Request");
		return;
	} 
	var url="/tracking.php";
	url=url+"?p="+pagename+"&r="+referer;
	url=url+"&sid="+Math.random();
	xmlHttp.onreadystatechange=stateChanged_tracking;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}
function stateChanged_tracking() { 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") { 
		if(xmlHttp.responseText == 'ok') {
			return true;
		}
	} 
}

function GetXmlHttpObject_tracking() { 
	var objXMLHttp=null;
	if (window.XMLHttpRequest) {
		objXMLHttp=new XMLHttpRequest();
	} else if (window.ActiveXObject) {
		objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP");
	}
	return objXMLHttp;
}