Edit/Troubleshoot my fb app

Very simple and quick project, I need to edit some things in my app. 1. Edit the allow page of my app - I'm having problem with the auth_dialog. 2. My app has a feature where it posts a photo automatically and it contains the display pic of the user. Now I noticed that the photo and the display pic of the user are saved in my cpanel. Everytime a new user does the app, it saves the photos. Imagine if 1000 people does the app, it would save 2000 photos! Now I want to change that. I want to have only one or two files that overwrite for each user. That's all. Budget is 30$