554228 Xzero Classifieds Script Modifications PHP/MySQL

I'm looking for somebody that is very fluent with PHP & MySQL and can make some modifications for me. I'm using the script from Xzero Classifieds. i want to use different banners in different cities. Every time user choose new city, banner i listed only on that city, should show up. Also i need to improve following: [login to view URL] I want to use city column instead of price column on main page. Let me know if you can do it!