There were a lot of errors when I ran the frontpage through a validator.
One of your "problems" is that you are only supposed to use an "ID" once on a page.
This code is all right:
It is not a big deal, and most browsers will probably not care about it, but it could potentially cause havoc.
If I were you, I would get the Firebug plugin for Firefox, and use that to identify what exactly seems to be the problem.
I would also get this plugin: Html Validator for Firefox and Mozilla and clean up the code.
You don't have to do this, but it will make it a lot easier to identify what is causing problems in the future.