function fb_login() {
	FB.Facebook.get_sessionState().waitUntilReady(function() {
	    var user = FB.Facebook.apiClient.get_session() ? FB.Facebook.apiClient.get_session().uid : null;
	    if (!user){
	    	return;
	    } else if(user){
			$.post("/auth/loginfb", function(data){
				if(data == 'FALSE'){
					location.href = '/auth/fb';					
				} else {
					location.href = data;
				}
			});
	    }
	});
}