var lastScrollY=0;

function heartBeat(){ 
	diffY=document.documentElement.scrollTop; 
	percent=.1*(diffY-lastScrollY); 
	if(percent>0){
		percent=Math.ceil(percent); 
	}else{
		percent=Math.floor(percent); 
	}
	if(document.getElementById("lovexin12")!=null){
		document.getElementById("lovexin12").style.top=parseInt(document.getElementById("lovexin12").style.top)+percent+"px";
		lastScrollY=lastScrollY+percent; 
	}else{
		clearInterval(sh);
	}
}

var sh=window.setInterval("heartBeat()",1);