I was going to come up with my own example, but I don't really have that much time, so this is somebody elses. It's very easy to make a non javascript drop down menu in compliant browsers, but a bit more understanding is needed for making it work in IE.
Check out the page source of that example, and you'll see how its done.
Here is this sites explaination:
http://www.xs4all.nl/~peterned/csshover.html
And here is the example:
http://www.xs4all.nl/~peterned/examples/cssmenu.html
Good luck.