D7 Custom Menu Problem

<?php
function productmenu_menu() {
        global $base_url;
        $top_level = array('Color Printers','Black & White Printers','Color MFP','Black & White MFP','Wide Format','Fax Machines');
        $items['productmenu/products'] = array(
            'title' => 'New Products',
            'access callback' => TRUE,
//          'menu_name' => 'Test Menu',
            'expanded' => TRUE,
            'page callback' => '_productmenu_menu_page',
            'page arguments' => array('Top Level'),
            'type' => MENU_NORMAL_ITEM,
      );
      $id = 10000;
      foreach ($top_level as $cat) {
                $items["productmenu/products/" . urlencode($cat)] = array(
                    'title' => $cat,
                    'page callback' => '_productmenu_menu_page',
                    'page arguments' => array(url("$base_url/productscategory/$id")),
                    'access callback' => TRUE,
                    'expanded' => TRUE,
                );
                                $id++;
      }
      dpm($items);
//    file_put_contents('/tmp/drupal.debug',print_r($items,true));
    return $items;
}
function _productmenu_menu_page($arg1 = NULL, $arg2 = NULL) {
    $output = '';
    if ($arg1 != '') {
        $output = "location: $arg1";
    }
    return $output;
}