OLD:

	if (($node->name() == 'li') && ($id = $node->attributes('id'))) {
		if ($node->attributes('class')) {
			$node->addAttribute('class', $node->attributes('class').' item'.$id);
		} else {
			$node->addAttribute('class', 'item'.$id);
		}
	}



NEW:

	if (($node->name() == 'li') && ($id = $node->attributes('id'))) {

		$class_name = '';
		if ($newItem = $menu->getItem($id)) {
			$tmp = clone($newItem);
			$class_name = $tmp->class_name;
		}
		if ($node->attributes('class')) {
			$node->addAttribute('class', $node->attributes('class').' item'.$id . ' ' . $class_name);
		} else {
			$node->addAttribute('class', 'item'.$id . ' ' . $class_name);
		}
	}