You may want to take a look here:
http://webfx.eae.net/dhtml/combobox/combobox.htm
For the Auto Hide feature, search Google for menu and auto hide. Before VS.NET introduced the concept, stuff like this was already on the web, as a menu that would pop-up when you hover your mouse near the border of the window.
I believe I have a bookmark for a menu like this somewhere. If I find it, I'll post it.
Imar
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Imar Spaanjaars
Everyone is unique, except for me.