100% Header / Fixed Body

[dano9258]

Ok, so I've searched and searched now for 2.5 hours how to get this right. What I want is a header and navbar area that is 100% of the screen. The body of the site I want to be 1200px. But when I change everything, the body is 1200px and the header is 100%, but the logo and everything is way to the left. What I want is the header and navbar to stretch out to 100% of the screen, but the items (logo, menu items, toplinks) all stay within the body width of 1200px, centered in the page. This way, the red line that I have under my Navtab's extends 100% of the screen. Please, please, please, help me!

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Any ideas guys? I'm really trying to get this fixed today as I won't have much time to work on the site until Wednesday