На странице Flypage ссылки предыдущий/следующий товар не имеют в себе ID категории - [VM1] Дизайн, оформление

?page=shop.product_details&flypage=flypage.tpl&product_id=92&category_id=0

?page=shop.product_details&product_id=92&category_id=21&flypage=flypage.tpl

$url_parameters = 'page=shop.product_details&product_id='.$next_product['product_id'].'&flypage='.$ps_product->get_flypage($next_product['product_id']).'&pop='.$pop;

$url_parameters = 'page=shop.product_details&flypage='.$ps_product->get_flypage($next_product['product_id']).'&category_id='.$category_id;
   

$url_parameters = 'page=shop.product_details&product_id='.$previous_product['product_id'].'&flypage='.$ps_product->get_flypage($previous_product['product_id']).'&pop='.$pop;

$url_parameters = 'page=shop.product_details&flypage='.$ps_product->get_flypage($next_product['product_id']).'&product_id='.$next_product['product_id'].'&category_id='.$category_id;

$recent[$k]['product_url'] = $sess->url("page=shop.product_details&product_id=$prod_id&category_id=$category_id&flypage=$flypage");

$recent[$k]['product_url'] = $sess->url("page=shop.product_details&flypage=$flypage&product_id=$prod_id&category_id=$category_id");

// Get the neighbor Products to allow navigation on product level
$neighbors = $ps_product->get_neighbor_products( !empty( $product_parent_id )? $product_parent_id : $product_id );
$next_product = $neighbors['next'];
$previous_product = $neighbors['previous'];
$next_product_url = $previous_product_url = '';
if( !empty($next_product) ) {
	$url_parameters = 'page=shop.product_details&flypage='.$ps_product->get_flypage($next_product['product_id']).'&category_id='.$category_id;
    if( $manufacturer_id ) {
    	$url_parameters .= "&manufacturer_id=" . $manufacturer_id;
    }
    if( $keyword != '') {
    	$url_parameters .= "&keyword=".urlencode($keyword);
    }
	if( $pop == 1 ) {
		$next_product_url = $sess->url( $_SERVER['PHP_SELF'].'?'.$url_parameters );
	} else {
		$next_product_url = str_replace("index2","index",$sess->url( $url_parameters ));
	}
}
if( !empty($previous_product) ) {
	$url_parameters = 'page=shop.product_details&flypage='.$ps_product->get_flypage($next_product['product_id']).'&product_id='.$next_product['product_id'].'&category_id='.$category_id;
    if( $manufacturer_id ) {
    	$url_parameters .= "&manufacturer_id=" . $manufacturer_id;
    }
    if( $keyword != '') {
    	$url_parameters .= "&keyword=".urlencode($keyword);
    }
	if( $pop == 1 ) {
		$previous_product_url = $sess->url( $_SERVER['PHP_SELF'].'?'.$url_parameters );
	} else {
		$previous_product_url = str_replace("index2","index",$sess->url( $url_parameters ));
	}
}

$tpl->set( 'next_product', $next_product );
$tpl->set( 'next_product_url', $next_product_url );
$tpl->set( 'previous_product', $previous_product );
$tpl->set( 'previous_product_url', $previous_product_url );

$parent_id_link = $db_product->f("product_parent_id");
$return_link = "";
if ($parent_id_link <> 0 ) {
	$q = "SELECT product_name FROM #__{vm}_product WHERE product_id = '$product_parent_id' LIMIT 0,1";
	$db->query( $q );
	$db->next_record();
	$product_parent_name = $db->f("product_name");
	$return_link = "&nbsp;<a class=\"pathway\" href=\"";
	$return_link .= $sess->url($_SERVER['PHP_SELF'] . "?page=shop.product_details&product_id=$parent_id_link");
	$return_link .= "\">";
	$return_link .= $product_parent_name;
	$return_link .= "</a>";
	$return_link .= " ".vmCommonHTML::pathway_separator()." ";
}
$tpl->set( 'return_link', $return_link );

// Create the pathway for our template
$navigation_pathway = $tpl->fetch( 'common/pathway.tpl.php');

if ($ps_product_category->has_childs($category_id) ) {
	$category_childs = $ps_product_category->get_child_list($category_id);
	$tpl->set( 'categories', $category_childs );
	$navigation_childlist = $tpl->fetch( 'common/categoryChildlist.tpl.php');
}

<input type="hidden" name="category_id" value="<?php echo  $category_id  ?>" />

Спасибо за Ваше обращение к поставщику АНОНИМ касательно:
Название товара: Поло
Артикул: 166
Ссылка: http://site.ru/index.php?option=com_virtuemart&page=shop.product_details&flypage=flypage.tpl&product_id=512&Itemid=14

$Itemid = $sess->getShopItemid();

$category_id = vmRequest::getInt('category_id');