var 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*/}     
         
percent=.1*(diffY-lastScrollY);      
if(percent>0)percent=Math.ceil(percent);      
else percent=Math.floor(percent);      
document.getElementById("adleft").style.top=parseInt(document.getElementById("adleft").style.top)+percent+"px";     
document.getElementById("adright").style.top=parseInt(document.getElementById("adright").style.top)+percent+"px";     
lastScrollY=lastScrollY+percent;      
}     
   
function adhide(names){document.getElementById(names).style.display='none';}    
function screencl(names){if(screen.width<=1000){adhide(names);}}
function dl_start(){
zcode="<div id='adleft' style='left:10px;position: absolute;z-index:1;top:100px;width:120px'><div style='width:60px;height:232px;background:#ccc;border:#999 solid 1px;'><img src='http://www.legaldaily.com.cn/tongyong/images/2012-xckl-001.gif' border='0'></div><div align='left' style='background:#fff;font-size:12px; width:69px;height:20px;color:red;cursor:hand; text-align:center;' onclick=adhide('adleft')>关闭</div></div>";
ycode="<div id='adright' style='right:10px;position: absolute;z-index:1;top:100px;width:120px'><div style='width:60px;height:232px;background:#ccc;border:#999 solid 1px;'><img src='http://www.legaldaily.com.cn/tongyong/images/2012-xckl-002.gif' border='0'></div><div align='left' style='background:#fff;font-size:12px; width:69px;height:20px;color:red;cursor:hand; text-align:center;' onclick=adhide('adright')>关闭</div></div>";
document.write(zcode);
document.write(ycode);
screencl('adleft');
screencl('adright');
window.setInterval("heartBeat()",1);
}