Facebook API resources?

[rebolavo]

Hello everyone,
I wish you had a nice day.
Could any one help me please with some recourses about Facebook API?
I am about creating a project at college, and the very first step is that I wanna check an email whether this email is used to an facebook account or not-meaning that logging in would be provided by the user entering his/her email and facebook password then if the person is a valid facebook user , then he/she can log in to our API program. But I don't know how to return that information from facebook...
Any resources may help ,,,
Thanks
I am using JQUERY MOBILE ..

[454]

Here are some of the API sources: http://developers.facebook.com/preferred...resources/