decoded exploit page dF

<script language="javascript">

function dF(s)
{
   var s1 = unescape(s.substr(0, s.length-1));
   var t='';
   for(i=0;i<s1.length;i++)
      t+=String.fromCharCode(s1.charCodeAt(i)-s.substr(s.length-1,1));
   document.write(unescape(t));
}

</script>