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 
    {/*Netscape   stuff*/} 

//alert(diffY); 
percent=.1*(diffY-lastScrollY); 
if(percent>0)percent=Math.ceil(percent); 
else percent=Math.floor(percent); 
document.getElementById("leftDIV").style.top=parseInt(document.getElementById("leftDIV").style.top)+percent+"px";
document.getElementById("rightDIV").style.top=parseInt(document.getElementById("leftDIV").style.top)+percent+"px";

lastScrollY=lastScrollY+percent;
//alert(lastScrollY);
}

sidebar1= "<div id=leftDIV style='left:30px; PosITION:absolute; TOP:200px;'></div>"
sidebar2 = "<div id=rightDIV style='right:30px; PosITION:absolute; TOP:200px;'><a href='Info/DefaultMore.aspx?LabelId=21'><img src='images/njgg.jpg' width='100' height='220' border='0'></a><br><a href='javascript:closeAD();' style='TEXT-DECORATION: none'><font color='#000000'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;关闭</font></a></div>"

document.write(sidebar1); 
document.write(sidebar2); 

//下面这段删除后，对联将不跟随屏幕而移动。
window.setInterval("heartBeat()",1); 
//-->

function closeAD() 
{ 
document.getElementById("leftDIV").style.display='none'; 
document.getElementById("rightDIV").style.display='none'; 
}