There is an example on:

The actual example page:

It looks up client info and auto fill fields. I'd like to implement something similar, but am looking for a way to "find" the customer first in a dropdown box
by name then have id stored somehow and maybe an onchange or something will retrieve the customer number, the autofill fields. Put another way, how to implement this using a dropdown, because who remembers 10,000 customer id's? Surely someone has done something like this.
I'm using php/mysql.