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