<style type="text/css">
*{margin:0;padding:0;}
.div1{height:100%;margin:0 auto;border-left:5px solid #F00;border-right:5px solid #F00;}
</style>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
$(function(){
$(".div1").css({
height:$(window).height()
});
$(window).resize(function(){
$(".div1").stop(true,false).animate({
width:$(document).width()*0.8
},150)
});
$(window).resize();
});
</script>
<div class="div1"></div>
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