Create Facebook app + small changes in guestlistscript

Last years we used a script for a guestlist for our parties. Visitors can sign in on [login to view URL] (example) with their Facebook. After this their details are saved in a database and on Facebook a line is placed on their wall and they automaticly attend on the facebook event. This year we want to use the script again but somehow the line on the Facebook wall and attending on the event doesn't work anymore. I assume that Facebook made some small changes. All the details are still placed in our database so the only problem is Facebook in the script. What we want: - Make a new Facebook app for this script so we can use it for all (5) events - Correct the current script so that the visitor will 'attend' on the event and a line is placed on their timeline. It's a small correction i assume.