lastScrollY=0;
function hb2(){ 
var diffY;
var diffl;
if (document.documentElement && document.documentElement.scrollTop)
{
    diffY = (document.documentElement.offsetTop-302)/2;
	diffl=(document.documentElement.offsetLeft-480)/2
}
else if (document.body)
 {
	 diffY = (document.body.clientHeight-302)/2;
	 diffl=(document.body.clientWidth-480)/2
 }
else
    {/*Netscape stuff*/}

 document.getElementById("popwindow").style.top=diffY+"px";
  document.getElementById("popwindow").style.left=diffl+"px";
}
suspendcode="<div id=\"popwindow\" class='adclass2' style='left:25%; top:30%;width:480px;height:302px;background:url(/ad/bjj.png)' onclick=\"document.getElementById('popwindow').className='adclass_hidden';\"> </div>"

document.write(suspendcode);
hb2();