CSS - Css In Oscommerce

Hi everyone,

I really hope someone can hep me out with this.

I am trying to incorporate osCommerce into my existing site (www.flexopower.com). As the case usually is, FireFox is working like a dream, but IE 6 and 7 are not happy at all.

The shop is not centered and in IE 6 the styles for the left hand column seem to break for some reason.

Please could someone give me some advice on how to fix this problem. I'm a bit out of my depth.

Thanks!