A better cascading select list from http://www.bobbyvandersluis.com/articles/unobtrusivedynamicselect.php

"the code is open source, free for use and distribution, and is as is,
without warrenty. It's not a formal library, merely a code snippet and
solution to a specific problem, and therefore it doesn't contain a specific
license. hope this gives you enough info.
best regards,
Bobby"