<!DOCTYPE html>
<html>
<head>
<script src="jquery-1.4.2.min.js"></script>
</head>
<script type=text/javascript>
$(function(){
//var a = $(window).height();
alert($(window).height()*0.6);
$('div').css('height',$(window).height()*0.6);
})
</script>
</html>