<script language="JavaScript">
 var newtop=0
 var newleft=0
 if (navigator.appVersion.indexOf("MSIE") != -1) {
   layerStyleRef="layer.style.";
   layerRef="document.all";
   styleSwitch=".style";
  }

 function doMouseMove() {
  layerName = 'iit'
  eval('var curElement='+layerRef+'["'+layerName+'"]')
                     eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility="hidden"')
  eval('curElement'+styleSwitch+'.visibility="visible"')
  eval('newleft=document.body.clientWidth-curElement'+styleSwitch+'.pixelWidth')
  eval('newtop=document.body.clientHeight-curElement'+styleSwitch+'.pixelHeight')
  eval('height=curElement'+styleSwitch+'.height')
  eval('width=curElement'+styleSwitch+'.width')
  width=parseInt(width)
  height=parseInt(height)
  if (event.clientX > (document.body.clientWidth - 5 - width))
  {
   newleft=document.body.clientWidth + document.body.scrollLeft - 5 - width
  }
  else
  {
   newleft=document.body.scrollLeft + event.clientX
  }
  eval('curElement'+styleSwitch+'.pixelLeft=newleft')

  if (event.clientY > (document.body.clientHeight - 5 - height))
  {
   newtop=document.body.clientHeight + document.body.scrollTop - 5 - height
  }
  else
  {
   newtop=document.body.scrollTop + event.clientY
  }
  eval('curElement'+styleSwitch+'.pixelTop=newtop')
}

 document.onmousemove = doMouseMove;

</script>
<script language="javascript">
 if (navigator.appVersion.indexOf("MSIE") != -1) { 
  document.write('<div ID=OuterDiv>')
  document.write('<img ID=iit src="img/rabbit.gif" STYLE="position:absolute;TOP:0pt;LEFT:0pt;Z-INDEX:2;visibility:hidden;">')
  document.write('</div>')
 }
</script>

注：此效果只能在IE浏览器中实现，本例中所用的图形放在与本页面同级的“img”文件夹内，名为rabbit.gif