<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
</head>
<body>
<div id="elem"></div>
<script language="JavaScript" type="text/javascript">
var elem = document.getElementById('elem');
var height_old = elem.offsetHeight;
elem.innerHTML="text";
var height = elem.offsetHeight;
alert(height_old+' '+height);
</script>
</body>
</html>