--- ps_product.php	2009-04-01 21:28:11.000000000 +0100
+++ ps_product.php.new	2009-04-29 21:53:53.000000000 +0100
@@ -1608,6 +1608,18 @@
 			// Get the product_parent_id for this product/item
 			$product_parent_id = $this->get_field($product_id, "product_parent_id");
 
+                        // LW PATCH - Get the category of this product - used later to drive category-based multiple purchases
+                        $sesq = "SELECT category_id FROM #__{vm}_product_category_xref WHERE product_id='$product_id'";
+                        $db->setQuery($sesq); $db->query();
+                        $db->next_record();
+                        $sesprodcat = $db->f("category_id");
+			if ($sesprodcat == 28) {
+				$ses_cat_discount = TRUE;
+			} else {
+				$ses_cat_discount = FALSE;
+			}
+			// END LW PATCH
+
 			if( !$check_multiple_prices ) {
 				/* Added for Volume based prices */
 				// This is an important decision: we add up all product quantities with the same product_id,
@@ -1622,6 +1634,18 @@
                     $parent = false; 
                 }
                 for ($i=0;$i<$cart["idx"];$i++) {
+					// LW PATCH - If any product in the cart is in the same category then treat as volume purchase
+					if ($ses_cat_discount) {
+						$sesq = "SELECT category_id FROM #__{vm}_product_category_xref WHERE product_id='".$cart[$i]["product_id"]."'";
+                                                $db->setQuery($sesq); $db->query();
+                                                $db->next_record();
+                                                $sesprodchildcat = $db->f("category_id");
+                                                if ($sesprodchildcat == $sesprodcat) {
+                                                        $quantity += $cart[$i]["quantity"];
+                                                }
+
+					} else {
+
                     if ($cart[$i]["product_id"] == $product_id) {
                         if ($parent) {
                         	$parent_id  = $cart[$i]["parent_id"];
@@ -1631,6 +1655,8 @@
                         }
                     }
                 }
+                		}
+				// END LW PATCH
                 if ($parent) {
                     for ($i=0;$i<$cart["idx"];$i++) {
                         if (@$cart[$i]['parent_id'] == $parent_id) {