// JavaScript Document
lastScrollY=0;
function heartBeat(l,r){ 
var diffY;
if (document.documentElement && document.documentElement.scrollTop)
    diffY = document.documentElement.scrollTop;
else if (document.body)
    diffY = document.body.scrollTop
else
    {/*Netscape stuff*/}
    
//alert(diffY);
percent=.1*(diffY-lastScrollY); 
if(percent>0)percent=Math.ceil(percent); 
else percent=Math.floor(percent); 
document.getElementById(l).style.top=parseInt(document.getElementById(l).style.top)+percent+"px";
document.getElementById(r).style.top=parseInt(document.getElementById(r).style.top)+percent+"px";

lastScrollY=lastScrollY+percent; 
//alert(lastScrollY);
}
//¹Ø±Õ°´Å¥
function close_left1(){
    left1.style.visibility='hidden';
}
function close_left2(){
    left2.style.visibility='hidden';
}
function close_right1(){
    right1.style.visibility='hidden';
}
function close_right2(){
    right2.style.visibility='hidden';
}