Dropdown menus displace the page.

Hi, I'm using WP 2.7 and Atahualpa 3.3.2. I have reproduced this problem on Firefox 3, IE 7, and Chrome.

It says somewhere in style.css that a certain css specification (position: absolute;) is set so that menus won't cause disfiguration of the layout. However, while on my pages without dropdowns there is no disfiguration, when I go to any of the pages that do have dropdowns and then mouse over different areas of the dropdown menu, there is extreme layout disfiguration. I spent a couple of days playing with style.css to try to fix it, but I cannot figure it out--and now I think maybe the problem is actually happening in header.php.

This page (my home page) works perfectly: http://www.mhl333.org/ -- On this page, you can hover over the top navigation and the dropdown menus overlay the page, as expected.

But if you click on, for example, Photograph Archive in the top navigation to get to this page:
http://www.mhl333.org/photograph-arc...essing-manual/ and then hover over the various areas of the top navigation, the layout gets severely disfigured.

Would love any pointers to a fix. Other than that it seems like a great theme.

Thanks,

Zoe