Something so annoying is that transparency of PNG images is removed in IE6
I got this from this awesome website
I always remembered it by the blue green car that you can drag around ~ I’ve been using it for a while ~
Download the script here, then use this:
<!--[if lt IE 7]> <script defer type="text/javascript" src="https://pushka.com/p/pngfix.js"></script> <![endif]-->