What you mean by that? vBulletin does that lame thing?
Here's the view source of your popup I just got:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Advertisement</title>
</head>
<body topmargin="0" leftmargin="0" marginheight="0" marginwidth="0">
<script language="JavaScript" type="text/javascript"><!--
var xbuff = 0; var ybuff = 0;
if (window.innerWidth)
{
xbuff = window.innerWidth;
ybuff = window.innerHeight;
}
else
{
xbuff = document.body.clientWidth;
ybuff = document.body.clientHeight;
}
window.resizeBy(400 - xbuff, 400 - ybuff);
document.write('<iframe src="http://ilead.itrack.it/clients/Nedstat/c8806/popup.asp?campaignid=8806&websiteid=5374&scriptid=47588&subwebsiteid=AdS410100&viralref=0&kid=346483&bid=1238776&dat=410100&keyword=null" frameborder="0" width="400" height="400" marginheight="0" marginwidth="0" scrolling="no" noresize></iframe>\n');
document.write('<div style="position:absolute;left:0;top:0;">');
document.write('<img src="http://sel.as-eu.falkag.net/sel?cmd=ban&kid=346483&bid=1238776&dat=410100&wrd=null&rdm='+Math.random()+'" width="1" height="1" border="0">');
document.write('</div>');
//-->
</script>
</body>
</html>