function heartBeat(){
lastScrollY=0;
var diffY = document.body.scrollTop ;
var percent=1*(diffY-lastScrollY);


if(percent>0)
    percent=Math.ceil(percent);
else 
    percent=Math.floor(percent);
var love1 = document.getElementById('lovexin1');
love1.style.left="20px";
love1.style.position="absolute";
love1.style.top="100px";
love1.style.pixelTop+=percent;
var love2 = document.getElementById('lovexin2');
love2.style.right="20px";
love2.style.position="absolute";
love2.style.top="100px";
love2.style.pixelTop+=percent;

lastScrollY=lastScrollY+percent;
}