【www.gdgbn.com--php常用代码】


lastScrollY=0;
function heartBeat(){
diffY=document.body.scrollTop;
percent=.3*(diffY-lastScrollY);
if(percent>0)percent=Math.ceil(percent);
else percent=Math.floor(percent);
document.all.lovexin1.style.pixelTop+=percent;
document.all.lovexin2.style.pixelTop+=percent;
lastScrollY=lastScrollY+percent;
}
function hide() 
{  
lovexin1.style.visibility="hidden";
lovexin2.style.visibility="hidden";
}
window.setInterval("heartBeat()",1);

本文来源：http://www.gdgbn.com/jiaocheng/20765/