Populating text fields from dynamic select

Question

I have been searching the net for a javascript/ajax solution
that will populate a number of text fields based on the selection
from a dynamic select field. Specifically, when the person selects
a company name, the companies address and phone number gets pulled
from a second recordset that gets filtered by the choice from the
dropdown. This needs to be done without postback.
The page is built using php/mysql and the select is populated
by one of the recordsets.
Any direct help or steering to a solution would be
appreciated.

Answer 1

Thanks for the reply.
Right now I'm starting with a blank form and once I get my head wrapped around this then I was going to modify what is already in use.
I'm attaching my scheme and xml file.
Thanks!
Derrick
I get an error when trying to upload my schema. I am pasting the content of the file here. I call it proofout.xsd
<?xml version="1.0" encoding="utf-8"?>
<xs:schema elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="userList" type="UserList" />
<xs:complexType name="User">
  <xs:sequence>
   <xs:element name="csrName" type="xs:string" />
   <xs:element name="csrExt" type="xs:int" />
   <xs:element name="csrFax" type="xs:string" />
   </xs:sequence>
   </xs:complexType>
   <xs:complexType name="UserList">
   <xs:sequence maxOccurs="unbounded">
    <xs:element name="user" type="User" />
    </xs:sequence>
    </xs:complexType>
    </xs:schema>