求 悬浮广告的代码！

<script type="TEXT/JAVASCRIPT">
<!--
var brOK=false;
var mie=false;
var vmin=2;
var vmax=5;
var vr=3;
var timer1;
var floatad;
function movechip(chipname)
{
if(brOK)
{
eval("chip="+chipname);
if(!mie)
{
pageX=window.pageXOffset;
pageW=window.innerWidth;
pageY=window.pageYOffset;
pageH=window.innerHeight;
} 
else
{
pageX=window.document.body.scrollLeft;
pageW=window.document.body.offsetWidth-8;
pageY=window.document.body.scrollTop;
pageH=window.document.body.offsetHeight;
}
chip.xx=chip.xx+chip.vx;
chip.yy=chip.yy+chip.vy;
chip.vx+=vr*(Math.random()-0.5);
chip.vy+=vr*(Math.random()-0.5);
if(chip.vx>(vmax+vmin))  chip.vx=(vmax+vmin)*2-chip.vx;
if(chip.vx<(-vmax-vmin)) chip.vx=(-vmax-vmin)*2-chip.vx;
if(chip.vy>(vmax+vmin))  chip.vy=(vmax+vmin)*2-chip.vy;
if(chip.vy<(-vmax-vmin)) chip.vy=(-vmax-vmin)*2-chip.vy;
if(chip.xx<=pageX)
{
chip.xx=pageX;
chip.vx=vmin+vmax*Math.random();
}
if(chip.xx>=pageX+pageW-chip.w)
{
chip.xx=pageX+pageW-chip.w;
chip.vx=-vmin-vmax*Math.random();
}
if(chip.xx>=680)
{
chip.xx=chip.xx-20;
chip.vx=-vmin-vmax*Math.random();
}
if(chip.yy<=pageY)
{
chip.yy=pageY;
chip.vy=vmin+vmax*Math.random();
}
if(chip.yy>=pageY+pageH-chip.h)
{
chip.yy=pageY+pageH-chip.h;
chip.vy=-vmin-vmax*Math.random();
}
if(!mie)
{
eval('document.'+chip.named+'.top ='+chip.yy);
eval('document.'+chip.named+'.left='+chip.xx);
}
else
{
eval('document.all.'+chip.named+'.style.pixelLeft='+chip.xx);
eval('document.all.'+chip.named+'.style.pixelTop ='+chip.yy);
}
chip.timer1=setTimeout("movechip('"+chip.named+"')",80);
}
}function stopme(chipname)
{
if(brOK)
{
eval("chip="+chipname);
if(chip.timer1!=null)
{
clearTimeout(chip.timer1)
}
}
}function floatad()
{
if(navigator.appName.indexOf("Internet Explorer")!=-1)
{
if(parseInt(navigator.appVersion.substring(0,1))>=4) brOK=navigator.javaEnabled();mie=true;
}
if(navigator.appName.indexOf("Netscape")!=-1)
{
if(parseInt(navigator.appVersion.substring(0,1))>=4) brOK=navigator.javaEnabled();
}
floatad.named="floatad";
floatad.vx=vmin+vmax*Math.random();
floatad.vy=vmin+vmax*Math.random();
floatad.w=1;
floatad.h=1;
floatad.xx=0;
floatad.yy=0;
floatad.timer1=null;
movechip("floatad");
}document.write("<div  id='floatad'  style='position:  absolute;width:80;top:0;left:578;visibility: visible;z-index: 1'>");
document.write('<a  href=http://www.ad-young.com  target=_blank>');
document.write('<img  src=http://ad4.sina.com.cn/sina/zhou/jindujiang8080.GIF  border=0  width=80  height=80></a></div>');
floatad();
//-->
</script>