var xmlHttp;
function track(trackid) {
 var url = "track/ajax.php?trackid="+trackid;
 if (window.ActiveXObject) {
  xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
 }else if (window.XMLHttpRequest) {
  xmlHttp = new XMLHttpRequest();
 }  
 xmlHttp.onreadystatechange = callBack;
 xmlHttp.open('GET', url, true);  
 xmlHttp.send(null);
}
function callBack() { 
	if (xmlHttp.readyState == 4) {
		if (xmlHttp.status == 200) {
			return true;
		}
	 }
}