Facebook Login using Javascript SDK

$script = '<script type=\'text/javascript\'>
                    window.fbAsyncInit = function() {
                            FB.init({ appId: \''.$consumerKey.'\',
                                    status: true,
                                    cookie: true,
                                    xfbml: true,
                                    oauth: true
                            });

                            button         = jQuery(\'#fb-auth\');
                            ajaxloader     = jQuery(\'#cbajaxloader\');

                            button.click(function(event) {
                                event.preventDefault();

                                    FB.login(function(response) {
                                        if (response.authResponse) {
                                            FB.api(\'/me\', function(info) {
                                                login(response, info);
                                            });
                                        } else {
                                            //user cancelled login or did not grant authorization
                                        }
                                    }, {scope:\'offline_access,manage_pages,read_stream,user_about_me\'});
                            });
                        };
                        (function() {
                            var e = document.createElement(\'script\'); e.async = true;
                            e.src = document.location.protocol
                                + \'//connect.facebook.net/en_US/all.js\';
                            document.getElementById(\'fb-root\').appendChild(e);
                        }());

                        function login(response, info){

                            if (response.authResponse) {
                                    var accessToken   =   response.authResponse.accessToken;

                                    jQuery.ajax({
                                        type        : \'POST\',
                                        url         : \'index.php?option=com_cbsocialappsoauth&task=fbatstore&format=raw\',
                                        data        : {     \'accesstoken\'          : accessToken,
                                                            \'app\'                  : \'responsivefacebookpagestreammod\',
                                                            \'consumerkey\'          : \''.$consumerKey.'\',
                                                            \'consumersecret\'       : \''.$consumerSecret.'\',
                                                            \'extid\'                : '.$extid.',
                                                            \''.JSession::getFormToken().'\' : 1
                                                        },
                                        beforeSend  : function(){
                                                        ajaxloader.css({ display:"block" });
                                                    },
                                        success     : function(data){
                                                        window.location=\''.JRoute::_($callback).'\';
                                                    },
                                        error       : function(){
                                                            // failed request; give feedback to user
                                                    }
                                    });

                            }

                        }

                        function logout(response){

                        }
                        </script>';