There are 2 CSS files you can use to override styles in IE.

For IE 6 using the IESpecific.css file

For IE 7 use the IE7Specific.css file

These files are included using IE Comment syntax so that other browsers are not affected by them. If you view the source of the rendered page you will see how they are included:

<!--[if lt IE 7]>

<script src="http://www.mojoportal.com/ClientScript/IE7.js" type="text/javascript"></script>

<link rel="stylesheet" href="http://www.mojoportal.com/Data/Sites/1/skins/mojosite-brightside13/IESpecific.css" type="text/css" id="IEMenuCSS" />

<![endif]-->

<!--[if IE 7]>

<script src="http://www.mojoportal.com/ClientScript/IE8.js" type="text/javascript"></script>

<link rel="stylesheet" href="http://www.mojoportal.com/Data/Sites/1/skins/mojosite-brightside13/IE7Specific.css" type="text/css" id="IE7MenuCSS" />

<![endif]-->

Hope it helps,

Joe