Refreshing a form starting from a combo box change

I'm new in this list (subscribed yesterday, at night) and already new in PHP Programming. I guess sombebody has already answered this question: How can I procced to update a form from a combo box change, bringing the rest of values necessary to fill the form ? An example: A form with Name: -> textbox Adress: -> textbox Company: -> combo box Contact: -> textbox When you choose a Company (this combo is filled from an Oracle database table), the Contact textbox is automatically filled with its contact in the same table). Thanks for any help Luiz Augusto G. Flores - Amix Tel: 3085-2277 e-mail: lflores@vesper.com.br