So I'm working on this website for my dad (http://tendonaid.com/) and it works nice in modern browsers, but apparently he's getting comments on how the top navigation doesn't work on Internet Explorer (7 and lower, I think). It's shifts to the right instead of centering in the middle.
My question is, how do I fix this? Or, is there some sort of if/or conditional comment thing I can do that says IF IE... use this class for the div / OR (any other browser) use this other class?