[support] AHAH 403 error

[Scott]

Okay, I've been at this all day but no joy.  I have seen the question
asked several times but no answers.  When I click the submit button I
get a 403 error message.

It's my understanding that the path ('a_module/js/%') should trigger the
function ('a_module_search_js').  Instead I get the 403 error.

/* hook_menu */
function a_module_menu() {
  $items = array();
  $items['admin/settings/a_module'] = array(
    'title' => 'AModule',
    'description' => 'Provides the configuration options for how AModule
operates on the site.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('a_module_admin_settings'),
    'access arguments' => array('administer a_module'),
    'file' => 'a_module.admin.inc',
  );

  $items['a_module/js/%'] = array(
    'page callback' => 'a_module_search_js',
    'page arguments' => array(2),
    'type' => MENU_CALLBACK,
  );

  return $items;
}

/* the submit button from a form */
  $form['submit'] = array(
    '#type' => 'submit',
    '#value' => t('Submit'),
    '#submit' => array('a_module_a_module_submit_handler'),
    '#ahah' => array(
      'path' => 'a_module/js/0',
      'wrapper' => 'div_id',
      'method' => 'replace',
      'effect' => 'fade',
    ),