Calling all CSS Wizards

K, pretty big CSS n00b…with that said, here is my current problem:

Trying to construct a drop down menu using CSS. Very close to completion just having issues with the drop down itself not staying visible when trying to roll down. See for yourself: here . CSS is viewable in the page source. I think it has something to do with the different content areas(divs) bordering one another and how they interact. If I expand the height on my menu to say 50px, the drop down list stays up just fine. Only prob is, I can’t have the list set to that height. I’m exhausted trying to solve this, anyone wanna take a stab?

xJ