When I view the page with the changes I made to the ie specific css it seems to look about the same as it does in FireFox. I'm including a copy of the css that I'm using and a screen shot of what I get when I test it for reference.
Also, I have done more testing on the dropdowns and I'm not able to get this part working at all. Was this every working in IE6? What has been customized or modified since it was working? If it was not working to begin with please describe the steps you took to implement this menu or include a preset for it so it can be tested.
