gbarr on "Center Menu in twenty eleven"

I am using a twenty eleven child theme and I need to get my top menu centered. I know that this has been a frequently addressed topic. I have spent quite a bit of time on this trying a few different suggestions including this one....
http://www.bozzmedia.com/posts/twenty-eleven-theme-center-navigation-menu/

I have not been able to find a solution that works on my site yet. My site is

http://drprincetta.com/

Thank you in advance!