Как добавить надпись "Товар в корзине" после нажатия кнопки купить? - [VM1] Модификации и хаки

<?php if( !defined( '_VALID_MOS' ) && !defined( '_JEXEC' ) ) die( 'Direct Access to '.basename(__FILE__).' is not allowed.' ); 
mm_showMyFileName(__FILE__);
$button_lbl = $VM_LANG->_('PHPSHOP_CART_ADD_TO');
$button_cls = 'addtocart_button';
if( CHECK_STOCK == '1' && !$product_in_stock ) {
	$button_lbl = $VM_LANG->_('VM_CART_NOTIFY');
	$button_cls = 'notify_button';
	$notify = true;
} else {
	$notify = false;
}
?>
<form action="<?php echo $mm_action_url ?>index.php" method="post" name="addtocart" id="addtocart<?php echo $i ?>" class="addtocart_form" <?php if( $this->get_cfg( 'useAjaxCartActions', 1 ) && !$notify ) { echo 'onsubmit="handleAddToCart( this.id );return false;"'; } ?>>
    <?php echo $ps_product_attribute->show_quantity_box($product_id,$product_id); ?>
	<input type="submit" class="<?php echo $button_cls ?>" value="<?php echo $button_lbl	?>" title="<?php echo $button_lbl ?>" onclick="document.getElementById('text1').style.visibility='visible';" />
<?php //print_r($_SESSION['cart']);
 $flag=false;
 foreach($_SESSION['cart'] as $cart)
 {
 if ($cart['product_id']==$product_id){
 $flag=true;
 }
 }
 if($flag)
 {echo '<div id="text1"><br/>Товар в корзине</div>';}
 else
 {echo '';}
?>
<div id="text1"><br/>Товар в корзине</div>
    <input type="hidden" name="category_id" value="<?php echo  @$_REQUEST['category_id'] ?>" />
    <input type="hidden" name="product_id" value="<?php echo $product_id ?>" />
    <input type="hidden" name="prod_id[]" value="<?php echo $product_id ?>" />
    <input type="hidden" name="page" value="shop.cart" />
    <input type="hidden" name="func" value="cartadd" />
    <input type="hidden" name="Itemid" value="<?php echo $sess->getShopItemid()?>" />
    <input type="hidden" name="option" value="com_virtuemart" />
    <input type="hidden" name="set_price[]" value="" />
    <input type="hidden" name="adjust_price[]" value="" />
    <input type="hidden" name="master_product[]" value="" />
</form>

<?php if( !defined( '_VALID_MOS' ) && !defined( '_JEXEC' ) ) die( 'Direct Access to '.basename(__FILE__).' is not allowed.' ); 
mm_showMyFileName(__FILE__);
$button_lbl = $VM_LANG->_('PHPSHOP_CART_ADD_TO');
$button_cls = 'addtocart_button';
if( CHECK_STOCK == '1' && !$product_in_stock ) {
	$button_lbl = $VM_LANG->_('VM_CART_NOTIFY');
	$button_cls = 'notify_button';
	$notify = true;
} else {
	$notify = false;
}
?>
<form action="<?php echo $mm_action_url ?>index.php" method="post" name="addtocart" id="addtocart<?php echo $i ?>" class="addtocart_form" <?php if( $this->get_cfg( 'useAjaxCartActions', 1 ) && !$notify ) { echo 'onsubmit="handleAddToCart( this.id );return false;"'; } ?>>
    <?php echo $ps_product_attribute->show_quantity_box($product_id,$product_id); ?>
	<input type="submit" class="<?php echo $button_cls ?>" value="<?php echo $button_lbl	?>" title="<?php echo $button_lbl ?>" onclick="document.getElementById('text<?php echo $i ?>').style.visibility='visible';" />
<?php //print_r($_SESSION['cart']);
 $flag=false;
 foreach($_SESSION['cart'] as $cart)
 {
 if ($cart['product_id']==$product_id){
 $flag=true;
 }
 }
 if($flag)
 {echo '<div id="text<?php echo $i ?>"><br/>Товар в корзине</div>';}
 else
 {echo '';}
?>
<div id="text<?php echo $i ?>"><br/>Товар в корзине</div>
    <input type="hidden" name="category_id" value="<?php echo  @$_REQUEST['category_id'] ?>" />
    <input type="hidden" name="product_id" value="<?php echo $product_id ?>" />
    <input type="hidden" name="prod_id[]" value="<?php echo $product_id ?>" />
    <input type="hidden" name="page" value="shop.cart" />
    <input type="hidden" name="func" value="cartadd" />
    <input type="hidden" name="Itemid" value="<?php echo $sess->getShopItemid()?>" />
    <input type="hidden" name="option" value="com_virtuemart" />
    <input type="hidden" name="set_price[]" value="" />
    <input type="hidden" name="adjust_price[]" value="" />
    <input type="hidden" name="master_product[]" value="" />
</form>