Form Element - Event Trigger

[Limca]

Guys,

1. I am creating a "Service Call Register" Form which Customer Info as well as "Problem Reported Details".
2. I have maintained Customer Info in "Customer Master" Table.
3. In the Form I have provided a Combo Box to fill in Customer Name,
4. Combo Box Values are populated from Customer Master Table.

Unitll here every thing works fine.
My next step is - The moment user selects a customer in Combo Box,
The same form should fetch and display Customer Address, Phone Numbers and Contact Person.
And the user continues entering "Problem Reported Details".

Is it possible to do in PHP.
If Yes, Please tell me how.

P.l.e.a.s.e
Regards
Limca Beethoven