Create a code of javascript that checks Facebook like button

This project is to create a Javascript code that can see whether a Facebook like button has already been liked. When embedding a Facebook button - Facebook returns either a Like button or a greyed out Like button ... I would like to be able to have a javascript code that returns 2 integers: (1 if Like button has not been liked) or (2 if Like button has been liked). We understand that if we use Facebook Connect we can request a list of pages a user likes, however, we would like to be able to determine if a user is on a particular page if the facebook button has already been liked.