In this case try this one:
* add
PHP Code:
$smarty->assign('current_category', $current_category);
to the "product.php" script, right before this code
PHP Code:
if (!empty($product_info)) {
$location[] = array(
* use
Code:
{$current_category.category}
in the skin/common_files/customer/main/product.tpl" template.