try { rtu = top.document.referrer; } catch(e) { rtu = document.referrer }
var site = window.location.host;
var page = window.location.pathname;
src = '/tracking/tracking.php';
src += '?site='+escape(site);
src += '&page='+escape(page);
src += '&ref='+escape(rtu);

document.writeln('<iframe width="0" height="0" border="0" frameborder="0" src="'+src+'"></iframe>');