Артикул автоматом в новом товаре - [VM1] Управление товарами, атрибутами, типами, ценами

<input type="text" class="inputbox"  name="product_sku" value="<?php $db->sp("product_sku"); ?>" size="32" maxlength="64" />

<?php 
echo '<input type="text" class="inputbox" name="product_sku" value="';
if (empty( $d["product_sku"])) {
$q = "SELECT MAX(product_sku) AS product_sku FROM #__{vm}_product";
$db->query( $q );
$db->next_record();
$list_sku = intval($db->f("product_sku"))+1; //максимальный номер артикула+1
$d['product_sku'] = $list_sku;
$valid = true;
}
echo $list_sku.'"size="32" maxlength="64" />'; 
?> 

<?php 
$list_sku = $db->sp("product_sku");
if (!$list_sku) {
  $q = "SELECT MAX(product_sku) AS product_sku FROM #__{vm}_product";
  $db->query( $q );
  $db->next_record();
  $list_sku = intval($db->f("product_sku"))+1;
}
echo '<input type="text" class="inputbox" name="product_sku" value="'.$list_sku.'" size="32" maxlength="64" />'; 
?>

<td width="79%"> 
  <?php 
    $list_sku = $db->sf("product_sku");
    if (!$list_sku) {
      $query = "SELECT MAX(product_sku) FROM #__{vm}_product";
      $db->setQuery($query);
      $list_sku = $db->loadResult() + 1;
    }
    echo '<input type="text" class="inputbox" name="product_sku" value="'.$list_sku.'" size="32" maxlength="64" />'; 
  ?>
</td>