I saw you just accepted an almost exact job of what i'm looking for. I need a php/ajax/mysql solution to implement a 4 step chained select from 4 fields in a database.
MYSQL Fields: Year|Make|Model|Color
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Similar to the example above, but with 4 selectboxes being derived dynamically from a database and then return the 4 selected items so I can query the database for items. The solution must work in all browsers. If you can deliver this to me, let me know.