main nav menu at the top of the page, above any "header" image

Thanks again for your help with menu positioning. Unfortunately, my client now has a different layout in mind and would like the nav bar (along with the logo) placed at the top of the home page, above the header (maybe just a picture, and the top part with the nav is the header). Like the picture shown by the URL below.

If you can help me with that, I would appreciate it.

Thanks,

Mark