Dropdown Menu Problem in Firefox

[Charged]

Just wondering if anyone had any idea how to fix the following problem:

I have a custom style on my board that I am setting up and the forum is contained inside a div.

Now the drop down menus on the navbar are working fine in IE but in firefox they drop down ok and operate fine.

The problem is that they are shifted over to the right a fair bit so they aren't dropping down under the actual link that you are clicking.

www.chargedcards.com/pokerforums

just click on the search one for an example of whats happening, if anyone knows what would be causing it and how to fix it then I would be grateful.

Thanks in advance