gistfile1.php

<?php

function classifieds_menu() {
  $items = array();
  
  $items['admin/classifieds'] = array(
    'title' => 'Classifieds system',
    'description' => 'Administer the classifieds system.',
    'access arguments' => array('access administration pages'),
    'position' => 'left',
    'page callback' => 'classifieds_admin_page',
    'weight' => -9999,
  );
  
  return $items;
}

function classifieds_admin_page() {
  require_once(drupal_get_path('module', 'system') . '/system.admin.inc');
  $output .= system_admin_menu_block_page();

  return $output;
}