var move = 1;
function scroll() {
   if(navigator.appName == "Microsoft Internet Explorer" && document.compatMode == "CSS1Compat") {
      var height = document.body.parentNode.scrollTop;
   } else {
      var height = document.body.scrollTop;
   }
   if(move<30 && height) {
      height = (height>2) ? Math.ceil(height*.2) : 1;
      move++;
      scrollBy(0,-height);
      setTimeout("scroll()",20);
   } else {
      scrollTo(0,0);
      move = 1;
   }
}