var lastScrollY=-120;//初始化下调200高
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
	 该空为NETSCAPE浏览器,暂时先不解决
	*/
} 
var percent = 0.1*(diffY-lastScrollY);
if(percent>0) percent=Math.ceil(percent);
else percent=Math.floor(percent); 
 //document.getElementById("lovexin12_1").style.top=parseInt(document.getElementById("lovexin12_1").style.top)+percent+"px";
 document.getElementById("lovexin14_1").style.top=parseInt(document.getElementById("lovexin14_1").style.top)+percent+"px";
 lastScrollY = lastScrollY + percent; 
}