Untitled

<html>
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
		<title>Untitled Document</title>
	</head>
	<body>
		<div id="test" style="background-color: #f0f;">Test how wide this div is...</div>
		<script type="text/javascript">
			var div = document.getElementById('test');
			window.alert(div.clientWidth);
		</script>
	</body>
</html>