A blank window is displayed. Watch me play

<Script language = "JavaScript">
<! --
VaR then = new date ();
Then. settime (then. gettime () + 24*60*60*1000); // second
VaR cookiestring = new string (document. Cookie );
VaR cookieheader = 'popwin ';
VaR beginposition = cookiestring. indexof (cookieheader );
If (beginposition =-1)
{
VaR newtop = 0
VaR newleft = 0
If (navigator. appname = 'netscape '){
Layerstyleref = "layer .";
Layerref = "document. Layers ";
Styleswitch = "";
}
Else
{
Layerstyleref = "layer. Style .";
Layerref = "document. All ";
Styleswitch = ". Style ";

}
VaR autoclick_ OK = false;
Function toexit (){
Autoclick_ OK = true;
Document. Cookie = "cookie9 = popwin; expires =" + then. togmtstring () + "; Path = /";
}

Function domousemove (){

Layername = 'iit'
Eval ('var curelement = '+ layerref +' ["'+ layername +'"] ')
Eval (layerref + '["' + layername + '"]' + styleswitch + '. Visibility = "hidden "')

If (! Autoclick_ OK)
{
Eval ('curelement' + styleswitch + '. Visibility = "visible "')
} Else {
Eval ('curelement' + styleswitch + '. Visibility = "hidden "')
}

Eval ('newleft = Document. Body. clientwidth-curelement '+ styleswitch +'. pixelwidth ')
Eval ('newtop = Document. Body. clientheight-curelement '+ styleswitch +'. pixelheight ')
Eval ('height = curelement '+ styleswitch +'. height ')
Eval ('width = curelement '+ styleswitch +'. width ')
Width = parseint (width)
Height = parseint (height)
If (event. clientx> (document. Body. clientwidth-10-width ))
{
Newleft = Document. Body. clientwidth + document. Body. scrollleft-10-Width
}
Else
{
Newleft = Document. Body. scrollleft + event. clientX-10
}
Eval ('curelement' + styleswitch + '. pixelleft = newleft ')

If (event. clienty> (document. Body. clientheight-5-height ))
{
Newtop = Document. Body. clientheight + document. Body. scrolltop-5-height
}
Else
{
Newtop = Document. Body. scrolltop + event. clientY-10
}
Eval ('curelement' + styleswitch + '. pixeltop = newtop ')
}

Document. onmousemove = domousemove;

If (navigator. appname = "Netscape "){

}
Else
{
Document. Write ('<Div id = outerdiv> ')
Document. write ('<a href = "http://www.2bu.cn" target = "_ blank"> </a> ')
Document. Write ('</div> ')

}
}
-->
</SCRIPT>