self.onError=null;
currentX = currentY = 0;  
whichIt = null;           
lastScrollX = 0; lastScrollY = 0;
NS = (document.layers) ? 1 : 0;
IE = (document.all) ? 1: 0;

function heartBeat1() {
 if(IE) { 
    diffY = document.body.scrollTop; 
    diffX = 0; 
     }
 if(NS) { diffY = self.pageYOffset; diffX = self.pageXOffset; }
 if(diffY != lastScrollY) {
    percent = .1 * (diffY - lastScrollY);
    if(percent > 0) percent = Math.ceil(percent);
    else percent = Math.floor(percent);
  if(IE) document.all.sky.style.pixelTop += percent;
  if(NS) document.sky.top += percent; 
    lastScrollY = lastScrollY + percent;
 }
 if(diffX != lastScrollX) {
  percent = .1 * (diffX - lastScrollX);
  if(percent > 0) percent = Math.ceil(percent);
  else percent = Math.floor(percent);
  if(IE) document.all.sky.style.pixelLeft += percent;
  if(NS) document.sky.top += percent;
  lastScrollY = lastScrollY + percent;
 } 
} 
if(NS || IE) action = window.setInterval("heartBeat1()",1);