Ok, sorry I posted prematurely. I solved my problem by using this in the index.php
<?php
if (isset($HTTP_GET_VARS['products_id'])){
// Randelia Custom_META_Tags_Per_Item. Includes TITLE!
echo ShowMETA('product_info', (int)$HTTP_GET_VARS['products_id'], $languages_id);
} else {
// Randelia Custom_META_Tags_Per_Item. Includes TITLE!
echo ShowMETA('categories', $cPath, $languages_id);} ?>