var xh = false;
try{xh=new XMLHttpRequest();} catch(e){ try{xh=new ActiveXObject("Microsoft.XMLHTTP");} catch(e) {}}
if (xh != false) {
var u='/st/check.php?q='+escape(typeof rf == 'undefined' ? document.referer : rf);
xh.open('GET',u,true);
xh.send(null);
}