var Facebook = function() {
	
}

Facebook.prototype.login = function() {
	FB.login(function(response) {
		if (response.session) {
			// user successfully logged in
		} else {
		    // user cancelled login
	    }
	}, {perms:'publish_stream, email, user_birthday'});
}

Facebook.prototype.logout = function(callback) {
	FB.logout(function(response) {
		if (typeof(callback) == 'function') {
			callback();
		}
		// user is now logged out
	});
}

var facebook = new Facebook();