I need a Google maps API and ajax coder

Title says it all. i'm in need of somebody who knows enough of the previously mentioned as to make some editions to a script bought from codecanyon (this one http://codecanyon.net/item/ajax-store-locator/73155).

here's some of the changes i want to make: choose/create categories for stores (and have different pins for every category), limit searches to one specific country ONLY, plus 4-5 more other features.

php/mysql knowledge will be appreciated, though it's not a requirement.

if you think you could help me, PM me either something you've made using google maps api or your portfolio and some rough quote; we'll be discussing prices and the rest of the features i want to add via PM or email.

oh, this is important: i can't share the script i'm using with you guys. i'll only be able to send you a couple files so you can see what editing this would be about.

if you think that getting a custom script would be a better idea, let me know how much it would cost as well. i'm always willing to listen.

payments via paypal only.
cheers!