place menu outside of its own div?

I am working on a new homepage with WordPress as the backend. I am trying to design a menu/navigation system for it that will be dynamic. The structure looks like this:
——Nav Menu—–
—Dynamic Menu—
———————-
|| Content box ||
|| ||
———————-
The problem is that the dynamic menu is based on the current “content” and must be called from within the “post” loop which is located inside the content box; but I want the menu to appear above the content box (just below the Nav menu).
The only way I’ve found to do this is to use “static” positioning, but this seems to cause problems, for instance, when I scroll the statically positioned items don’t scroll and are covered over by the content box. Also, it seems hard to center all the items in the middle with static positioning, and finally, it is very difficult for me to make sure that the dynamic menu appears just below the navigation menu.
Thanks for your help!