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<body>
<div id="a" style="width:500px; height:300px; position:absolute; background:#000000; left:0px; top:0px;"></div>
</body>
<script>
var timer
var obj=document.getElementById("a")
var Opacity =100
function disapper(){
obj.style.filter = "Alpha(opacity="+Opacity+")";
Opacity=Opacity-2
if(Opacity!=0)
{timer=setTimeout("disapper()",50)}
else
{clearTimeout(timer)
obj.parentNode.removeChild(obj)
}
}
function window.onload(){
disapper()
}
</script>