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;
   }
}

<!-- 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;

      //case: id = layerOutput ****  Doesn't WORK ! ****
      if (whichIt.offsetLeft == 4 && whichIt.offsetTop == 4) {
         //alert("请用鼠标键按住查询窗口的上端或下端，然后移动！");
         whichIt.style.pixelLeft = 800;
         whichIt.style.pixelTop = 150;
      }
      currentX = (event.clientX + document.body.scrollLeft);
      currentY = (event.clientY + document.body.scrollTop);  
      //alert("(currentX, currentY) = " +currentX +", " +currentY); 
   } else { 
      window.captureEvents(Event.MOUSEMOVE);
      if(checkFocus (e.pageX,e.pageY)) { 
         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;
      //alert("MoveIt (distanceX, distanceY) = " +distanceX +", " +distanceY); 
   } 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);