This is great! Now I can't tell whether it's my fault or a bug in the damn browser

Take a look at this page:
http://www.techjunkeez.com/articles.htm

There's a typical banner ad right below the heading "Latest Articles". It's supposed to be centered. It looks fine in IE and Opera but appears left aligned in 'fox.

Can someone take a look at the code (sorry it's all over the place) and tell me whether it's my fault or Firefox's?

If you get lost in the code, look for focusIN code.