[support] B7 Theme / Nice Menus drop down centered?

I'm trying to get nice menus to work on my B7 themed site, and I can't get the primary menus to center. I replaced the primary menu call with the header region (changed in page.tpl.php) and they show up, but I have changed every place I can think of, and it is still not centering the menus. Any theme gurus have an idea what I should be altering? Thanks -- Brett Evanson <mailto:brettev@gmail.com> brettev@gmail.com