кнопка добавить в корзину joomla2 virtuemart

Почему кнопка добавить в корзину в категории не работает?

В файл default.php категории добавил код:

<form method="post" class="product" action="index.php" id="addtocartproduct<?php echo $product->virtuemart_product_id ?>">
<div class="addtocart-bar">
<?php // Display the quantity box ?>
<!-- <label for="quantity<?php echo $product->virtuemart_product_id;?>" class="quantity_box"><?php echo JText::_('COM_VIRTUEMART_CART_QUANTITY'); ?>: </label> -->
<span class="quantity-box">
<input  type="text" class="quantity-input" name="quantity[]" value="1" />
</span>
<span class="quantity-controls">
<input type="button" class="quantity-controls quantity-plus" />
<input type="button" class="quantity-controls quantity-minus" />
</span>
<?php // Display the quantity box END ?>
<?php // Add the button
$button_lbl = JText::_('COM_VIRTUEMART_CART_ADD_TO');
$button_cls = ''; //$button_cls = 'addtocart_button';
if (VmConfig::get('check_stock') == '1' && !$product->product_in_stock) {
$button_lbl = JText::_('COM_VIRTUEMART_CART_NOTIFY');
$button_cls = 'notify-button';
} ?>
<?php // Display the add to cart button ?>
<span class="addtocart-button">
<input type="submit" name="addtocart"  class="addtocart-button" value="<?php echo $button_lbl ?>" title="<?php echo $button_lbl ?>" />
</span>
<div class="clear"></div>
</div>
<?php // Display the add to cart button END ?>
<input type="hidden" class="pname" value="<?php echo $product->product_name ?>">
<input type="hidden" name="option" value="com_virtuemart" />
<input type="hidden" name="view" value="cart" />
<noscript><input type="hidden" name="task" value="add" /></noscript>
<input type="hidden" name="virtuemart_product_id[]" value="<?php echo $product->virtuemart_product_id ?>" />
<?php /** @todo Handle the manufacturer view */ ?>
<input type="hidden" name="virtuemart_manufacturer_id" value="<?php echo $product->virtuemart_manufacturer_id ?>" />
<input type="hidden" name="virtuemart_category_id[]" value="<?php echo $product->virtuemart_category_id ?>" />
</form>

Кнопки появились но не работают.