lastScrollY=0;
function heartBeat(){
var diffY;
if (document.documentElement && document.documentElement.scrollTop)
diffY = document.documentElement.scrollTop;
else if (document.body)
diffY = document.body.scrollTop
else
{}
//alert(diffY);
percent=.1*(diffY-lastScrollY);
if(percent>0)percent=Math.ceil(percent);
else percent=Math.floor(percent);
document.getElementById("LeftAd").style.top=parseInt(document.getElementById("LeftAd").style.top)+percent+"px";
lastScrollY=lastScrollY+percent;
//alert(lastScrollY);
}

suspendcode="<DIV id=LeftAd style='Z-INDEX: 200; right: 6px; POSITION: absolute; TOP: 120px; width: 120; height: 68px;'><div><a href='http://www.cmmn.com.cn/cn/news/293.html' target='_blank'><img src='http://www.cmir.com.cn/files/ads/sm.gif' width='120' height='68' style='border:1px dotted #cccccc' ></a></DIV>"
document.write(suspendcode);
window.setInterval("heartBeat()",1);