Site works in IE but not in FireFox

I'm redesigning my website and it looks good in IE, but it's broken in Firefox. The URL for the new layout is http://www.byrequest.dj/byrequest/index.html . I know most of it is a styling issue, but I'm having troubles tracking it down. I also have a problem with my navigational script. When I click on a Nav Menu item with sub nav items, it expands to show a list of the sub nav items. I accomplish this by changing the display property from none to block. This works well in IE, but in FireFox, hiding the text causes the items to go away correctly, but it leaves a gaping hole in the menu.

Any suggestions?

If it works in IE but not FF then your code is wrong. Always get it working in a modern browser like FF first, then adjust it for IEs quirks and bugs.

Validate your code. You have a number of errors related to your <p> tags.