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Did a look at your site...
With IE everything is fine.
With Mozilla not so fine.
Have taken a look to the HTML source.
Sorry, but the code looks a little messy.
The start of the file shows a Doctype for HTM 4.01, whereas a little late the Doctype for XHTML (which is the original from XOOPS) is shown.
As I see there is a meta tag:
<meta name="generator" content="Microsoft FrontPage 4.0" />
I think there is some mix-up within your theme and/or templates.
I would recommend doing a clean rework of the theme and/or templates.
That means, if you will stay with XHTML:
write every tag lowercase, and quote every tag attribute.
If you want to validate your site you can take a look at
http://validator.w3.org/Your site gives about 175 errors at the moment.
Sorry that I couldn't give you a more joyful answer...
Maybe there is someone else, who can give you more help.
BTW from the visual design viewpoint, your site looks fine
Cheers
Robert