Konu eskimiş ama kısabir örnekte ben paylaşmak istedim.

<head> ve </head> arasına konacak kod
 
<script>
 function remLink() {
   if (window.lookupwin && window.lookupwin.open && !window.lookupwin.closed)
    {
     window.lookupwin.opener = null;
    }
 }
  function fnload()
  {
 
 }
  fnload();
 
</script>
==============================================
<body onload="fnload()">
==============================================
<body> ve </body> arasına konacak kod
<div id="FlyPrdList" style="position:absolute; visibility:hidden; z-index:2;">
<a target="_blank" href="hedef_link_buraya_yazılacak"><img src="banner_adresi_buraya_yazılacak" border="0"></a></div>
<script language="JavaScript">
       markW = 120;
       markH = 250;
       markX = 100;
       markY = 91;
       markRefresh = 20;
       if (!document.all) document.all = document;
       if (!document.all.FlyPrdList.style) document.all.FlyPrdList.style = document.all.FlyPrdList;
       wMark = document.all.FlyPrdList.style;
       wMark.width = markW;
       wMark.height = markH;
       navDOM = window.innerHeight;
 
       function setVals() {
        barW = 0;
        barH = 0;
        if (navDOM) {
         if (document.height > innerHeight) barW = 24;
         if (document.width > innerWidth) barH = 24;
         } else {
         innerWidth = document.body.clientWidth;
         innerHeight = document.body.clientHeight;
         }
        posX = ((innerWidth - markW)-barW) * (markX/100);
        posY = ((innerHeight - markH)-barH) * (markY/92);
        }
       function wRefresh() {
        wMark.left = posX + (navDOM?pageXOffset:document.body.scrollLeft);
        wMark.top = posY + (navDOM?pageYOffset:document.body.scrollTop);
        }
 
       function Show_Fly()
       {
        document.all("FlyPrdList").style.visibility  = "visible";
       } 
       function markMe() {
        setVals();
        window.onresize=setVals;
        markID = setInterval ("wRefresh()",markRefresh);
        setInterval('Show_Fly()', 1000);
       }
       window.onload=markMe;
 
       function CloseWindows()
       {
//          if(parent.windowHandle!=null && !parent.windowHandle.closed){
//            parent.windowHandle.close();
//          }
//          window.parent.close()
       }
    </script>
Çalışan örnek kendi sitemde görülebilir.