我是jsp的新手，请问如何实现在页面中增加一个随着页面滚动的小页面？？？？

<BODY>
<SCRIPT language=JavaScript> self.onError = null;
currentX = currentY = 0;  
whichIt = null;           
lastScrollX = 0; lastScrollY = 0;
NS = (document.layers) ? 1 : 0;
IE = (document.all) ? 1: 0; 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.LayerTree.style.pixelTop += percent;
if(NS) document.LayerTree.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.LayerTree.style.pixelLeft += percent;
if(NS) document.LayerTree.left += percent;
lastScrollX = lastScrollX + percent;
}
} function checkFocus(x,y) 
{ 
stalkerx = document.LayerTree.pageX;
stalkery = document.LayerTree.pageY;
stalkerwidth = document.LayerTree.clip.width;
stalkerheight = document.LayerTree.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("LayerTree") == -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)) { 
                whichIt = document.LayerTree;
                StalkerTouchedX = e.pageX-document.LayerTree.pageX;
                StalkerTouchedY = e.pageY-document.LayerTree.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;
} 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);</SCRIPT><table>
<tr><td height="600" valign="top">
<div id="LayerTree" style="position:relative; width:200px; height:200px; z-index:1; left: 100px; top: 120px; visibility: visible; overflow: scroll; background-color: #F5FBFE; border: 1px none #000000">
<img src="aa.jpg" width="30" height="30">dfgsdgsdfgdsfgfds

<!--在这里加东西 --> </div>
gfa<p>dsafsdfgfa<p>gfa<p>gfa<p>gfa<p>gfa<p>gfa<p>gfa<p>gfa<p>gfa<p>gfa<p>gfa<p>gfa<p>gfa<p>gfa<p>gfa<p>
</td></tr>
</table>
</BODY>