Почему Ajax запрос не выполняется: Uncaught ReferenceError?

<!DOCTYPE html>
<html lang="ru">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <link href="/admin/css/bootstrap.3.3.2.min.css" rel="stylesheet">
    <link href="/admin/css/font-awesome.css" rel="stylesheet">
</head>
<body>
    
    <link rel="stylesheet" href="../css/bootstrap.3.3.5.min.css"/>
    <link href="../admin/plugins/post/custom.css" rel="stylesheet">    
    <link href="../admin/plugins/post/css/style.css" rel="stylesheet">

    <script src="../admin/plugins/ckeditor/ckeditor.js"/>    
    <script>
        function authAjax(del_id) {

            var title = $("#title");
            var full = $("#full");

            var val1 = title.val();
            var val2 = full.val();

                $.ajax({
                    url: './plugins/post/init.php',
                    data:{                        
                        title: val1,
                        full: val2,                    
                        },
                    type: 'POST',
                    success: function(data){
                        //alert(data);
                        if (data > 0){
                            new PNotify({title: 'Запись добавлена.',text: '',type: 'success'});
                        }else{
                            if (data == 0){
                                new PNotify({title: 'Сохранение выполнено.',text: '',type: 'info'});    
                            }else{
                                if (data == 'del'){
                                    new PNotify({title: 'Запись удалена!', text: '', type: 'error'});
                                }else{
                                    new PNotify({title: 'Внимание!', text: 'Сохранение не удалось!', type: 'error'});
                                }
                            }
                        }
                    },
                });
           // }

        }
    </script>

    <script src="../js/jquery-1.11.2.min.js"></script>

    <form action="javascript:void(null);" method="post">

        <button id="submit" onclick="authAjax()" type="submit" class="btn btn-success" name="save-post">Сохранить</button> 
        <textarea type="text" class="textarea" id="editor1" name="editor1"></textarea>
    </form>

    <script type="text/javascript">
        CKEDITOR.replace( 'editor1' );
    </script>

    <script type="text/javascript" src="../js/bootstrap.3.3.5.min.js"></script>
    <script type="text/javascript" src="../admin/js/notify/pnotify.core.js"></script>
    <script type="text/javascript" src="../admin/js/notify/pnotify.buttons.js"></script>
    <script type="text/javascript" src="../admin/js/notify/pnotify.nonblock.js"></script>            

</body>
</html>