Cascading select menus in Rails?

I’m looking for a canned solution to creating cascading
select menus in Rails. Kind of like optgroup, except that
the lower-level items live in their own menus, as seen in:

Can anyone point me to some nicely packaged technology,
so I don’t have to fight with the JavaScript myself?

-r

http://www.cfcl.com/rdm Rich M.
http://www.cfcl.com/rdm/resume [email protected]
http://www.cfcl.com/rdm/weblog +1 650-873-7841

Technical editing and writing, programming, and web development