IE menu issues: dropdown not working

[misshellsf]

Hi,

I am having trouble with my dropdown menu in IE. In Firefox, the menu drops down nicely, but in IE there is no drop down. Does anyone know a fix for this?

Here is my test site:
http://califa.org/newsite/index.php

I know there are a few other design issues in IE, but just trying to get the menu working correctly first. Other than that, my page is validating correctly so know that can't be an issue.

Any help would be greatly appreciated.
Michele