var isDOM = (document.getElementById ? true : false); 
  var isIE4 = ((document.all && !isDOM) ? true : false);
  var isNS4 = (document.layers ? true : false);

  function getRef(id) {
	if (isDOM) return document.getElementById(id);
	if (isIE4) return document.all[id];
	if (isNS4) return document.layers[id];
  }
  var isNS = navigator.appName == "Netscape";

  function moveRightEdge() {
	var yMenuFrom, yMenuTo, yOffset, timeoutNextCheck;
	if (isNS4) {
	  yMenuFrom   = scroll.top;
	  yMenuTo     = windows.pageYOffset + 200;  
	} else if (isDOM) {
	  yMenuFrom   = parseInt (scroll.style.top, 10);
	  yMenuTo     = (isNS ? window.pageYOffset : document.body.scrollTop) + 300;
	}
	timeoutNextCheck = 500;

	if (yMenuFrom != yMenuTo) {
	  yOffset = Math.ceil(Math.abs(yMenuTo - yMenuFrom) / 20);
	  if (yMenuTo < yMenuFrom)
		yOffset = -yOffset;
	  if (isNS4)
		scroll.top += yOffset;
	  else if (isDOM)
		scroll.style.top = parseInt (scroll.style.top, 10) + yOffset;
		timeoutNextCheck = 10;
	}
	setTimeout ("moveRightEdge()", timeoutNextCheck);

  }