[Victor D]

Sorry I have missed that you need this in category.
add in your products.php before the line

$smarty->assign("products",$products);

this:

foreach($products as &$pp){
$pp['product_options'] = func_get_product_classes($pp['productid'], false);
}

and every product from your $products array will contain additional array with product options
so you just need to edit skin1/customer/main/products.tpl and skin1/customer/main/products_t.tpl as it was figured in my previous post