js广告，侧边老自动到最底下是什么问题
在www.czcec.com可以看到！

var   ad_float_left_src   = "http://www.czcec.com/img/ggao.jpg ";
var   ad_float_left_url   = "http://www.czcec.com/WebsiteVote.asp ";
var   ad_float_left_type   =   " ";
document.ns   =   navigator.appName   ==   "Microsoft   Internet   Explorer "
var   imgheight_close
var   imgleft
window.screen.width> 800   ?   imgheight_close=120:imgheight_close=120
window.screen.width> 800   ?   imgleft=8:imgleft=122
function   myload()
{
myleft.style.top=document.body.scrollTop+document.body.offsetHeight-imgheight_close;
myleft.style.left=imgleft;
leftmove();
}
function   leftmove()
  {
  myleft.style.top=document.body.scrollTop+document.body.offsetHeight-imgheight_close;
  myleft.style.left=imgleft;
  setTimeout( "leftmove(); ",50)
  }

function   MM_reloadPage(init)   {     //reloads   the   window   if   Nav4   resized
    if   (init==true)   with   (navigator)   {if   ((appName== "Netscape ")&&(parseInt(appVersion)==4))   {
        document.MM_pgW=innerWidth;   document.MM_pgH=innerHeight;   onresize=MM_reloadPage;   }}
    else   if   (innerWidth!=document.MM_pgW   ||   innerHeight!=document.MM_pgH)   location.reload();
}
MM_reloadPage(true)

function   close_float_left(){
  myleft.style.visibility= 'hidden ';
}

document.write( " <div   id=myleft   style= 'position:   absolute;width:80;top:280;left:5;visibility:   visible;z-index:   1 '> "
+ " <style> "
+ "A.closefloat:link,A.refloat:visited   {text-decoration:none;color:#000000;font-size:12px} "
+ "A.closefloat:active,A.refloat:hover   {text-decoration:underline;color:#0000FF;font-size:12px} "
+ " </style> "
+ " <table   border=0   cellpadding=0   cellspacing=0> <tr> <td> ");

if(document.ns){
if(ad_float_left_type!= "swf ")
  document.write( " <a   href= ' "   +   ad_float_left_url   +   " '   target   =   '_blank '> <img   src= ' "   +   ad_float_left_src   +   " '   WIDTH=100   height=287       border   =   0> </a> ");
else
  document.write( " <EMBED   src= ' "   +   ad_float_left_src   +   " '   quality=high     WIDTH=80   HEIGHT=80   TYPE= 'application/x-shockwave-flash '   id=changhongout   > </EMBED> ");

document.write( " </td> </tr> <tr> <td   width=100   height=200   align=right> </td> </tr> "
+ " </table> "
+ " </div> ");

myload()}




------解决方案--------------------
只是不滚动,没有自动到底