Кнопки плюс и минус в корзине товаров VirtueMart 2 - [VM2&3] Модификации и хаки

                    // UPDATE CART / DELETE FROM CART
 $action_url = $mm_action_url . basename($_SERVER['PHP_SELF']);
 $product_rows[$i]['update_form'] = '<form action="' . $action_url . '" method="post" style="display: inline;">
 <input type="hidden" name="option" value="com_virtuemart" />
 <input type="button" onclick="var qty_el = document.getElementById(\'quantity' . $i . '\'); var qty = qty_el.value; if( !isNaN( qty ) &amp;&amp; qty &gt; 0 ) qty_el.value--;this.form.submit();" value="&minus;" />
 <input id="quantity' . $i . '" type="text" title="' . $VM_LANG->_('PHPSHOP_CART_UPDATE'). '" size="4" maxlength="4" name="quantity" value="' . $cart[$i]["quantity"] . '" onchange="this.form.submit();" />
 <input type="button" onclick="var qty_el = document.getElementById(\'quantity' . $i . '\'); var qty = qty_el.value; if( !isNaN( qty )) qty_el.value++;this.form.submit();" value="+" />
 
 <input type="hidden" name="page" value="' . $page . '" />
 <input type="hidden" name="func" value="cartUpdate" />
 <input type="hidden" name="product_id" value="' . $_SESSION['cart'][$i]["product_id"] . '" />
 <input type="hidden" name="prod_id" value="' . $_SESSION['cart'][$i]["product_id"] . '" />
 <input type="hidden" name="Itemid" value="' . $sess->getShopItemid(). '" />
 <input type="hidden" name="description" value="' . stripslashes($cart[$i]["description"]). '" />
 </form>';
 $product_rows[$i]['delete_form'] = '<form action="' . $action_url . '" method="post" name="delete" style="display: inline;">
 <input type="hidden" name="option" value="com_virtuemart" />
 <input type="hidden" name="page" value="' . $page . '" />
 <input type="hidden" name="Itemid" value="' . $sess->getShopItemid(). '" />
 <input type="hidden" name="func" value="cartDelete" />
 <input type="hidden" name="product_id" value="' . $_SESSION['cart'][$i]["product_id"] . '" />
 <input type="hidden" name="description" value="' . $cart[$i]["description"] . '" />
 <input type="image" name="delete" title="' . $VM_LANG->_('PHPSHOP_CART_DELETE'). '" src="' . VM_THEMEURL . 'images/remove_from_cart.png" alt="' . $VM_LANG->_('PHPSHOP_CART_DELETE'). '" align="top" />
 </form>';

<form action="<?php echo JRoute::_ ('index.php'); ?>" method="post" class="inline" name="frm<?php echo $j ?>">
			<input type="hidden" name="option" value="com_virtuemart"/>
	
                
			<input type="text" title="<?php echo  JText::_ ('COM_VIRTUEMART_CART_UPDATE')?>.2" class="inputbox" size="3" maxlength="4" name="quantity" value="<?php echo $prow->quantity ?>" style="display:none;"/>
            		<select name="cantidad" id="cantidad" onchange="getval<?php echo $j ?>(this);"  value="<?php echo $prow->quantity ?>" title="<?php echo  JText::_ ('COM_VIRTUEMART_CART_UPDATE')?>">
                    <option  value="<?php echo $prow->quantity ?>"><?php echo $prow->quantity ?></option>
                <option value="1">1</option>
                <option value="2">2</option>
                <option value="3">3</option>
                <option value="4">4</option>
                <option value="5">5</option>
                <option value="6">6</option>
                <option value="7">7</option>
                <option value="8">8</option>
                <option value="9">9</option>
                <option value="10">10</option>
                <option value="11">11</option>
                <option value="12">12</option>
                <option value="13">13</option>
                <option value="14">14</option>
                <option value="15">15</option>
                <option value="16">16</option>
                <option value="17">17</option>
                <option value="18">18</option>
                <option value="19">19</option>
                <option value="20">20</option>
			</select>			
			<input type="hidden" name="view" value="cart"/>
			<input type="hidden" name="task" value="update"/>
			<input type="hidden" name="cart_virtuemart_product_id" value="<?php echo $prow->cart_item_id  ?>"/>
			<input type="submit" class="vmicon vm2-add_quantity_cart" id="actualizar" name="update" title="<?php echo  JText::_ ('COM_VIRTUEMART_CART_UPDATE')?>" align="middle" value=" " style="display:none;"/>
            <script type="text/javascript">
                    function getval<?php echo $j ?>(sel) {
					   document.frm<?php echo $j ?>.quantity.value = (sel.value);
					   document.frm<?php echo $j ?>.submit()
                    }
                </script>
		</form>