White square after loading in Mozilla

I'm running some beta 开发者_如何学编程tests in this URL: http://acquasports.esp.br/site/

Whenever I load the main page and the jquery is already loaded (when I click the company logo, per example), the browser Mozilla renders the menu area as a large white square.

What could be causing this?

There are different scripts running in the main page, maybe there is somekind of conflict:

• A toggleFade in the menu
• A horizontal scroll for news

Thanks for the attention,

Leo

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Solved. I used some div's instead of ul and il and the problem stopped.