php facebook login – ReferenceError: Can’t find variable: FBLogin

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Im trying to make a facebook login plugin on my wordpress site using this sdk

Im getting the ReferenceError: Can’t find variable: FBLogin when in console.When I click on the facebook login nothing happens

My facebook login php code is this one:

<?php 
include 'facebook/facebook.php';
function gazi_fb_loginForm(){

        gazi_fb_error_message();

        gazi_fb_LoadScript();

        if(is_user_logged_in()==false){

        ?>

            <div class="facebook_wrapper">
            <img src="<?php echo plugin_dir_url(__FILE__).'images/facebook_or.png';?>" style="border:none; box-shadow:none;">
            <br>
            <a href="javascript:void(0)" onClick="FBLogin();">

            <img src="<?php echo plugin_dir_url(__FILE__).'images/facebook_button.png';?>" alt="Fb Connect" title="Login with facebook" /></a></div>

        <?php 

        } 

    }



function gazi_fb_LoadScript(){

     global $wpdb;

     $gazi_option=$wpdb->prefix."gazi_option";

     $path =  plugin_dir_url(__FILE__);  // define path to link and scripts

    $pageURL = get_permalink();

    $sign = strpos($pageURL,'?')?'&':'?';

     //facebook app secret

$qry1="SELECT value FROM $gazi_option WHERE fieldname='gazi_facebook_app_secret'";

$facebook_app_secret = $wpdb->get_var($qry1);

$qry2="SELECT value FROM $gazi_option WHERE fieldname='gazi_facebook_app_id'";

$facebook_app_id = $wpdb->get_var($qry2);



     $facebook = new Facebook(array(

        'appId'     =>  $facebook_app_id,

        'secret'    => $facebook_app_secret,

        ));

    ?>

    <script type="text/javascript">

window.fbAsyncInit = function() {

    FB.init({

    appId      : "<?php echo $facebook_app_id; ?>", // replace your app id here

    status     : true, 

    cookie     : true, 

    xfbml      : true  

    });

};

(function(d){

    var js, id = 'facebook-jssdk', ref = d.getElementsByTagName('script')[0];

    if (d.getElementById(id)) {return;}

    js = d.createElement('script'); js.id = id; js.async = true;

    js.src = "//connect.facebook.net/en_US/all.js";

    ref.parentNode.insertBefore(js, ref);

}(document));



function FBLogin(){

    FB.login(function(response){

        if(response.authResponse){

            window.location.href = "<?php echo $pageURL.$sign;?>option=fblogin";

        }

    }, {scope: 'email'});

}

</script>

    <?php

    }



function gazi_fb_error_message(){

        if(isset($_SESSION['msg'])){

            echo '<div class="'.$_SESSION['msg_class'].'">'.$_SESSION['msg'].'</div>';

            unset($_SESSION['msg']);

            unset($_SESSION['msg_class']);

        }

    }



function gazi_fb_login_validate(){



    $path =  plugin_dir_url(__FILE__);  // define path to link and scripts

    $pageURL = get_permalink();

    $sign = strpos($pageURL,'?')?'&':'?';



    if(isset($_REQUEST['option']) && $_REQUEST['option']  == "fblogin"){

     global $wpdb;

     $gazi_option=$wpdb->prefix."gazi_option";

     //facebook app secret

      $qry1="SELECT value FROM $gazi_option WHERE fieldname='gazi_facebook_app_secret'";

      $facebook_app_secret = $wpdb->get_var($qry1);

      $qry2="SELECT value FROM $gazi_option WHERE fieldname='gazi_facebook_app_id'";

      $facebook_app_id = $wpdb->get_var($qry2);

        $facebook   = new Facebook(array(

            'appId' => $facebook_app_id,

            'secret' => $facebook_app_secret,

            'cookie' => TRUE,

        ));

        $fbuser = $facebook->getUser();

        if ($fbuser) {

            try {

                $user_profile = $facebook->api('/me');

            }

            catch (Exception $e) {

                echo $e->getMessage();

                exit();

            }

            if (!isset($user_profile['email'])) $user_profile['email'] = $user_profile['id'] . '@facebook.com';

            $user_fbid  = $fbuser;

            $user_email = $user_profile["email"];

            $user_fnmae = $user_profile["first_name"];



          if( email_exists( $user_email )) { // user is a member 

              $user = get_user_by('login', $user_email );

              $user_id = $user->ID;


              wp_set_auth_cookie( $user_id, true );

           } else { // this user is a guest

              $random_password = wp_generate_password( 10, false );

              $user_id = wp_create_user( $user_email, $random_password, $user_email );

              update_user_meta($user_id, 'avtar_image', 'https://graph.facebook.com/' . $user_profile['id'] . '/picture?type=large');

              wp_update_user(array(

                          'ID' => $user_id,

                          'display_name' => $user_profile['name'],

                          'first_name' => $user_profile['first_name'],

                          'last_name' => $user_profile['last_name']

                        ));

              wp_set_auth_cookie( $user_id, true );

           }



            wp_redirect( $pageURL.$sign.'login4=1');

            exit;



        }       

    }

}

?>

Does any one know how ti make it working what Im doing wrong?

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