$val = $engine->add_new_teacher($_POST['full_name'], $_POST['user_name'], $_POST['user_pass'], $_POST['department']);
             header("Location: ../Librarian.php?page=add_new_student");
             exit;
         }
     } else {
         header("Location: ../Librarian.php?page=add_new_student");
         exit;
     }
 }
 if (isset($_POST['upload_books'])) {
     require_once '../private/File_Manager.php';
     $manager = new File_Manager();
     $file = $_FILES['upload_file'];
     $uploaded = upload_file($file);
     if (strlen($uploaded) == 34) {
         $manager->Upload_Books('../files/' . $uploaded);
         header("Location: ../Librarian.php?page=library_books");
         exit;
     } else {
     }
 }
 if (isset($_POST['upload_cds'])) {
     require_once '../private/File_Manager.php';
     $manager = new File_Manager();
     $file = $_FILES['upload_file'];
     $uploaded = upload_file($file);
     if (strlen($uploaded) == 34) {
         $manager->Upload_CDs('../files/' . $uploaded);
         header("Location: ../Librarian.php?page=library_cds");
         exit;
     } else {