Replication of a facebook application

I currently have a facebook application that I pay ongoing service fees to use. The application can be viewed here: [login to view URL] I would like to cease paying ongoing fees for using this app by simply replicating the app so that I am able to load it to my Fan Page ([login to view URL]) direct. You will see that the application has (1) a fan-gate page (requiring the user to Like the page), and (2) a Coupon page providing the visitor with a discount coupon once they have Liked the page. The requirement for the app is that I may need to modify the image on both (1) and (2) in the future and require the flexibility to do so. This project should be simple and straightforward for facebook application developers familiar in creating fan-gated applications.