simple javascript task (select box read from cities based on zone) -- 2

I need an opencart/javascript developer to do a simple task I have module called AJAX Quick Checkout FREE (one-page-checkout, checkout checkout) [login to view URL] I added cities too my opencart , they are related to zones each zone id has group of cities the problem that the city is text box in the checkout and i changed it to select but it dont read from cities table based on chosen zone it needs some javascript edits i need someone to do , i did some stuff but need someone to complete i will give him test script to test on and then he send me the changes list of files the cities works well in registration and normal checkout but normal checkout is hidden to use the 1 page checkout I need to be delivered in the next few hours I will pay 10$ in this simple task contact me if interested