I think this is a bind thing?

I think this is a bind thing?

Hi folks,

I'm having trouble understanding how to make the second select box <select name="sp" id="sp"> box work just after it's been created.

Please see the script in action here:
http://spainpropertymart.com/dev/search_jquery/search.php

An alert should fire after changing the Provinces select box...

I've read some of the bind stuff that's recommended, but I'm not getting it!