Looks good, Patricia. If I had the vaguest idea how to implement a new dynamic menu I would hapily do it myself.
I have also found a couple of others that are worth looking at which claim to be accessible. I think that's an important criteria these days.
YADM - Yet Another Dynamic Menu
This one looks like a great choice for many reasons. It even drops in a static menu when JS is turned off in the client browser. The menu is valid XHTML and conforms to WAI Triple-A.
http://www.onlinetools.org/tools/yadm/
Others mentioned by the creator of this system:
Son of suckerfish, aqTree2, Gazingus
If I can help in any way (testing, for example) lemme know!