var lastScrollX=0;
var lastScrollY=0;     
function heartBeat(){    

var diffX;
var diffY; 
if (document.documentElement && document.documentElement.scrollTop)     
    diffX = document.documentElement.scrollTop;     
else if (document.body)     
    diffX = document.body.scrollTop     
else     
    {/*Netscape stuff*/}

if (document.documentElement && document.documentElement.scrollTop)     
    diffY = document.documentElement.scrollTop;     
else if (document.body)     
    diffY = document.body.scrollTop     
else     
    {/*Netscape stuff*/}     
         
percent=.1*(diffX-lastScrollX);      
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";  
lastScrollX=lastScrollX+percent;

percent=.1*(diffY-lastScrollY);      
if(percent>0)percent=Math.ceil(percent);      
else percent=Math.floor(percent);        
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(window.screen.width<=800){adhide(names);}}    

var left = "<style type=\"text/css\">body{margin:0px;font-size:12px;}img{border:0;}.topics{width:76px;height:352px;border:2px solid #29a3f6;padding:2px;}.topics dl{width:72px;height:348px;background:#fff;overflow:hidden;clear:right;}.topics dl dd{margin:5px;width:60px;height:60px;border-bottom:1px dotted #29a3f6;display:inline;float:left;}.topics dl ddimg{float:left;display:block;}</style>";
left +="<div class=\"topics\"><dl><dd><a href=\"http://www.openlab.cn/cisco\" target=\"_blank\"><img src=\"http://www.openlab.cn/ad/topic1.gif\" width=\"61\" height=\"49\" /></a></dd><dd><a href=\"http://www.openlab.cn/microsoft\" target=\"_blank\"><img src=\"http://www.openlab.cn/ad/topic5.gif\" width=\"61\" height=\"49\" /></a></dd><dd><a href=\"http://www.openlab.cn/oracle\" target=\"_blank\"><img src=\"http://www.openlab.cn/ad/topic2.gif\" width=\"61\" height=\"49\" /></a></dd>"
left +="<dd><a href=\"http://www.openlab.cn/linux\" target=\"_blank\"><img src=\"http://www.openlab.cn/ad/topic3.gif\" width=\"61\" height=\"49\" /></a></dd><dd><a href=\"http://www.openlab.cn/soft\" target=\"_blank\"><img src=\"http://www.openlab.cn/ad/topic4.gif\" width=\"61\" height=\"49\" /></a></dd></dl></div>"

xcode="<div id='adleft' style='left:20px;position: absolute;y-index:1;top:100px;'>"+ left +"</div>"; 
ycode="<div id='adright' style='right:10px;position: absolute;y-index:1;top:330px;'><img width='102' height='185' src='/ad/right_pf.jpg' /></div>";   

document.write(xcode);
document.write(ycode);   
  
screencl('adleft'); 
screencl('adright');   

window.setInterval("heartBeat()",1);