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have links in the menu which will target the main body div layer
If I understand you correctly, this means that all your linked information must be included in one HTML document, and the links just the switch visibility of SEVERAL main div layers that are "stacked up" on the z-axis in one screen position.
Sounds like you're trying to simulate frames -- check out the CSS forum for several discussions on how that might be approached. My final conclusion on that was that it's easier just to USE frames for real.