lastScrollY=0; 
function heartBeat0(){ 
diffY=document.body.scrollTop; 
percent=.1*(diffY-lastScrollY); 
if(percent>0)percent=Math.ceil(percent); 
else percent=Math.floor(percent); 
document.all.lovexin0.style.pixelTop+=percent; 
lastScrollY=lastScrollY+percent;} 
window.setInterval("heartBeat0()",1);