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multi-level select fields tutorial?

Posted: Thu Feb 10, 2011 3:30 pm
by someguyhere
I'm having a hard time finding a good tutorial on multi-level select fields...maybe I'm calling it the wrong thing. I want a select field displayed (loaded from mysql) that has a list of categories, and when an item is selected, it will refresh the page and add another (or replace it) select field showing a list of sub categories.

Thoughts?