Need help to fix Twenty Ten coding

Hello.

My site http://learntoa.com is basically a Twenty Ten, but the navigation bar is messed up. How do I fix it so that the text centres on the bar, and the dropdown menues so that they extend right beneath it?

Originally I wanted to make the navigation bar “wrap” around the main template, making a 3D illusion. Kind of like this: http://blogs.sitepoint.com/2010/10/31/simple-3d-effect-wrap-around-navigation-menu-in-photoshop/
Can I do this with just programming?