Hi Pheier,
Use the dev tools for internet explorer to find the problem, then use a css hack for internet explorer. Update the master page, or use a content editor webpart if you need to target a specific page.
For example:
<!--[if lt IE 8]>
<link href="ie7.css" rel="stylesheet" type="text/css" />
<![endif]-->
Cordialy.
Ostefn