JavaScript floating AD code in the lower right corner

Document.writeln ("<div id=" Qqaddiv "style=" Position:absolute; z-index:100; " > ");
Document.writeln ("<a Href=http://www.111cn.net/target=_blank onclick= ' Closer () ' ></a> ");
Document.writeln ("</div>");
var bodyfrm = (document.compatmode.tolowercase () = = "CSS tutorial 1compat")? Document.documentelement:document.body;
var adst = document.getElementById ("Qqaddiv"). Style;
Adst.top = (bodyfrm.clientheight-156) + "px";
Adst.left = (bodyfrm.clientwidth-254) + "px";
function Mover () {
Adst.top = (bodyfrm.scrolltop + bodyfrm.clientheight-156) + "px";
Adst.left = (Bodyfrm.scrollleft + bodyfrm.clientwidth-254) + "px";
}
This is the function that sets the display property of ADST to None.
function Closer () {
Adst.display= "None";
}
SetInterval ("Mover ();", 80);