Php: Populating 3 Listboxes

I was converting old asp files to php.

But I'm stuck at this point.

I'm looking for a triple combo listboxes where one has "book" the other "chapter" and the third "verse". The book is populated by a database table. Once book is selected then chapter is populated and then verse.

Any tutorial related to this?

The lists are standard HTML widgets, but you will want to use Javascript's onSelect so that selecting an item will trigger a query without having to submit. Sorry, don't have any tute links. Try a search.