How do I create something similar to this http://west.ballyfitness.com/ << the drop down navigation menu with dreamweaver?

Currently I already have a layout, with the images as buttons (navigation bar) , and for say the portfolio button, I want when it is mouseover, there will be a similar drop down menu ... linking to subcategories ..
Does n e one know how I can start? I have Dreamweavers CS3 for mac and Dreamweavers 8 for windows.

thank u in advance!!

Here is a pretty good tutorial that is similar to what your looking to do:

http://www.aspandjavascript.co.uk/ja...5Fversion%5F2/

And here is a product, specifically for dreamweaver:

http://f-source.com/buy/adobeMenu/

I hope this helps!