<body>
<center>
<div id="adv_1" style="width:200px; height:200px; background-color:#CCCC99; position:absolute; left:0px; top:0px;"></div>
<div style="width:768px; height:800px; background-color:#FFFF99;"></div>
<script language="javascript">
var adv=document.getElementById("adv_1");
adv.style.left=(this.screen.width-parseInt(adv.style.width.replace("px","")))/2+"px";
adv.style.top=(this.screen.height-parseInt(adv.style.height.replace("px","")))/2-100+"px";
function hide_div()
{
adv.style.display="none";
}
setTimeout("hide_div()",2000);
</script>
</center>
</body>
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