Drupal 6: Listendarstellung (item-list) mit odd / even CSS-Klassen erweitern (Zebra)

<?php
function THEMENAME_item_list($items = array(), $title = NULL, $type = 'ul', $attributes = NULL) {
  static $count = 0; // added
  $output = '<div class="item-list">';
  if (isset($title)) {
    $output .= '<h3>' . $title . '</h3>';
  }
 
  if (!empty($items)) {
    $output .= "<$type" . drupal_attributes($attributes) . '>';
    $num_items = count($items);
    foreach ($items as $i => $item) {
      $zebra = ($count % 2) ? 'odd' : 'even'; // added
      $count++; // added
      $attributes = array();
      $children = array();
      if (is_array($item)) {
        foreach ($item as $key => $value) {
          if ($key == 'data') {
            $data = $value;
          }
          elseif ($key == 'children') {
            $children = $value;
          }
          else {
            $attributes[$key] = $value;
          }
        }
      }
      else {
        $data = $item;
      }
      if (count($children) > 0) {
        $data .= theme_item_list($children, NULL, $type, $attributes); // Render nested list
      }
      if ($i == 0) {
        $attributes['class'] = empty($attributes['class']) ? 'first' : ($attributes['class'] . ' first');
      }
      if ($i == $num_items - 1) {
        $attributes['class'] = empty($attributes['class']) ? 'last' : ($attributes['class'] . ' last');
      }
      $attributes['class'] .= ' ' . $zebra;
      $attributes['class'] = trim($attributes['class']);
      $output .= '<li' . drupal_attributes($attributes) . '>' . $data . "</li>\n";
    }
    $output .= "</$type>";
  }
  $output .= '</div>';
  return $output;
}
?>