lastScrollY=0;

function ad(){ 

diffY=document.body.scrollTop; 

percent=.1*(diffY-lastScrollY); 

if(percent>0)percent=Math.ceil(percent); 

else percent=Math.floor(percent); 

document.all.ad1.style.pixelTop+=percent;

document.all.ad2.style.pixelTop+=percent;

lastScrollY=lastScrollY+percent; 

}

ad12="<div id=ad1 style='left:10px;POSITION:absolute;TOP:350px;'></div>"

document.write(ad12); 
ad14="<div id=ad2 style='right:10px;POSITION:absolute;TOP:350px;'><img src='fuwu.gif' border=0 width='105' height='253'></div>"
document.write(ad14); 
window.setInterval("ad()",1); 

// JavaScript Document