ÿþlastScrollY=0;

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*/}



percent=.1*(diffY-lastScrollY); 

if(percent>0)percent=Math.ceil(percent); 

else percent=Math.floor(percent); 

document.getElementById("QQMSN").style.top=parseInt(document.getElementById("QQMSN").style.top)+percent+"px";



lastScrollY=lastScrollY+percent; 

}

window.setInterval("heartBeat()",1);