To elaborate on what Ed says:
You will have to use a 3rd party program to create the menus, and it
will probably take quite a bit of trial and error to get it completely
correct, but it can be done. Search DynamicDrive.com for different scripts.
One thing to consider, though. There is a concern that many search
engines will not follow links that are in javascript menus - meaning a
vast majority of your site may not be spidered and indexed. If you are
determined to use drop down menus, you should also consider a text only
line of links.
Lastly, to paraphrase the web guru's (David F.) advice - if you have
questions about web design, you should post them in the
microsoft.public.publisher.webdesign NG.
Mike