lastScrollY=0;
function heartBeat(){
var diffY;
if (document.documentElement && document.documentElement.scrollTop)
    diffY = document.documentElement.scrollTop;
else if (document.body)
    diffY = document.body.scrollTop
percent=.1*(diffY-lastScrollY);
if(percent>0)percent=Math.ceil(percent); 
else percent=Math.floor(percent); 
document.getElementById("couplet_1").style.top=parseInt(document.getElementById("couplet_1").style.top)+percent+"px";
document.getElementById("couplet_2").style.top=parseInt(document.getElementById("couplet_2").style.top)+percent+"px";
lastScrollY=lastScrollY+percent; 
}
couplet1="<DIV id=\"couplet_1\" style='left:5px;POSITION:absolute;TOP:170px;display:'><div style='width:93px; height:290px;'><img src='../images/AL.gif' width='93' height='290' border='0'></div></div>"
couplet2="<DIV id=\"couplet_2\" style='right:5px;POSITION:absolute;TOP:170px;display:'><div style='width:93px; height:290px;'><img src='../images/AR.gif' width='93' height='290' border='0'></div></div>"
document.write(couplet1);
document.write(couplet2);
window.setInterval("heartBeat()",1);