请教一下各位，这段代码哪里有问题呢？

<SCRIPT type=text/javascript>
function FloatTop()
{
var startX1 =document.body.offsetWidth-205 ,startY1 = 5;
var startX2 =0,startY2 = 95;
var ns = (navigator.appName.indexOf("Netscape") != -1);
var d = document;
function ml(id,startX,startY)
{
  var el=d.getElementById?d.getElementById(id):d.all?d.all[id]:d.layers[id];
  if(d.layers)el.style=el;
  el.sP=function(x,y){this.style.left=x;this.style.top=y;};
  el.x = startX;
  el.y = startY;
  return el;
}
window.stayTopLeft=function()
{
  var pY = ns ? pageYOffset : document.body.scrollTop;
  ftlObj.y += (pY + startY1 - ftlObj.y)/8;
  ftlObj1.y += (pY + startY2 - ftlObj1.y)/8;
  ftlObj.sP(document.body.scrollLeft+document.body.offsetWidth-125, ftlObj.y);
  ftlObj1.sP(ftlObj1.x, ftlObj1.y);
  setTimeout("stayTopLeft()", 30);
}
//     ftlObj = ml("divStay",document.body.scrollLeft+document.body.offsetWidth-125,0);
//     ftlObj1 = ml("divStayTopLeft",0,30);
ftlObj = ml("divStay",(document.body.scrollLeft+document.body.offsetWidth)/2+220,0);
ftlObj1 = ml("divStayTopLeft",(document.body.scrollLeft+document.body.offsetWidth)/2+490,30);
stayTopLeft();
}
FloatTop();
</SCRIPT>
这个是LZ自己写的？
setTimeout("stayTopLeft()", 30);导致CPU100%的这句话最有可能，这里设置了每30毫秒无限重复执行 stayTopLeft();这个函数
里面用了不少算法，看代码像是某种移动滚动条的特效。