self.onError=null;
currentX = currentY = 0;
whichIt = null;
lastScrollX = 0; lastScrollY = 0;
NS = (document.layers) ? 1 : 0;
IE = (document.all) ? 1: 0;
<!-- STALKER CODE -->
function heartBeat() {
  if(IE) { diffY = document.body.scrollTop; diffX = document.body.scrollLeft; }
  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.floater.style.pixelTop += percent;
    if(NS) document.floater.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.floater.style.pixelLeft += percent;
    if(NS) document.floater.left += percent;
    lastScrollX = lastScrollX + percent;
  }	
}
<!-- /STALKER CODE --><!-- DRAG DROP CODE -->
function checkFocus(x,y) {
  stalkerx = document.floater.pageX;
  stalkery = document.floater.pageY;
  stalkerwidth = document.floater.clip.width;
  stalkerheight = document.floater.clip.height;
  if( (x > stalkerx && x < (stalkerx+stalkerwidth)) && (y > stalkery && y < (stalkery+stalkerheight))) return true;
  else return false;
}
function grabIt(e) {
  if(IE) {
    whichIt = event.srcElement;
    while (whichIt.id.indexOf("floater") == -1) {
      whichIt = whichIt.parentElement;
      if (whichIt == null) { return true; }
    }
    whichIt.style.pixelLeft = whichIt.offsetLeft;
    whichIt.style.pixelTop = whichIt.offsetTop;
    currentX = (event.clientX + document.body.scrollLeft);
    currentY = (event.clientY + document.body.scrollTop); 	
  }
  else {
   window.captureEvents(Event.MOUSEMOVE);
  if(checkFocus (e.pageX,e.pageY,floater)) {
    whichIt = document.floater;
    StalkerTouchedX = e.pageX-document.floater.pageX;
    StalkerTouchedY = e.pageY-document.floater.pageY;
  }
}
return true;
}
function moveIt(e) {
  if (whichIt == null) { return false; }
  if(IE) {
    newX = (event.clientX + document.body.scrollLeft);
    newY = (event.clientY + document.body.scrollTop);
    distanceX = (newX - currentX);distanceY = (newY - currentY);
    currentX = newX;currentY = newY;
    whichIt.style.pixelLeft += distanceX;
    whichIt.style.pixelTop += distanceY;
    if(whichIt.style.pixelTop < document.body.scrollTop) whichIt.style.pixelTop = document.body.scrollTop;
    if(whichIt.style.pixelLeft < document.body.scrollLeft) whichIt.style.pixelLeft = document.body.scrollLeft;
    if(whichIt.style.pixelLeft > document.body.offsetWidth - document.body.scrollLeft - whichIt.style.pixelWidth - 20) whichIt.style.pixelLeft = document.body.offsetWidth - whichIt.style.pixelWidth - 20;
    if(whichIt.style.pixelTop > document.body.offsetHeight + document.body.scrollTop - whichIt.style.pixelHeight - 5) whichIt.style.pixelTop = document.body.offsetHeight + document.body.scrollTop - whichIt.style.pixelHeight - 5;
    event.returnValue = false;
  } 
  else {
    whichIt.moveTo(e.pageX-StalkerTouchedX,e.pageY-StalkerTouchedY);
    if(whichIt.left < 0+self.pageXOffset) whichIt.left = 0+self.pageXOffset;
    if(whichIt.top < 0+self.pageYOffset) whichIt.top = 0+self.pageYOffset;
    if( (whichIt.left + whichIt.clip.width) >= (window.innerWidth+self.pageXOffset-17)) whichIt.left = ((window.innerWidth+self.pageXOffset)-whichIt.clip.width)-17;
    if( (whichIt.top + whichIt.clip.height) >= (window.innerHeight+self.pageYOffset-17)) whichIt.top = ((window.innerHeight+self.pageYOffset)-whichIt.clip.height)-17;
    return false;
  }
  return false;
}
function dropIt() {
  whichIt = null;
  if(NS) window.releaseEvents (Event.MOUSEMOVE);
  return true;
}
<!-- DRAG DROP CODE -->
if(NS) {
  window.captureEvents(Event.MOUSEUP|Event.MOUSEDOWN);
  window.onmousedown = grabIt;
  window.onmousemove = moveIt;
  window.onmouseup = dropIt;
}
if(IE) {
  document.onmousedown = grabIt;
  document.onmousemove = moveIt;
  document.onmouseup = dropIt;
}
if(NS || IE) action = window.setInterval("heartBeat()",1);