not really a fix for your problem but i find that conditional comment sorts out ie problems quickly
<!--[if lte IE 6]>
<link rel="stylesheet" type="text/
css" href="
css/ie6.
css" media="screen, print" />
<script defer type="text/javascript" src="
js/pngfix.
js"></script>
<![endif]-->
<!--[if gte IE 7]>
<link rel="stylesheet" type="text/
css" href="
css/ie7.
css" media="screen, print" />
<![endif]-->