The check-in page will have a button on it. A user would click on it and if required they would need to login to Facebook using the Facebook API and provision the app with the correct permissions.
You will need to use the code provided by Facebook for mobile web applications here:
[url removed, login to view]
The output of the button would be a list of places the users has checked into.
We will provide the API key and the GPS coordinates / Address for the checkin and the facebook place.