Hide automatically a popup message in N seconds

Hello,
thanks a lot for this nice module!
I want to suggest a bit more functionality of popup message. I think it would be nice to be able to automatically hide the message in a few seconds after its appearance.

PS I do this through changing in "dc_ajax_add_cart.js" :

(function ($, Drupal, window, document, undefined) {
  Drupal.behaviors.dcAjaxAddCart = {
    attach: function (context, settings) {
      // Close the add to cart overlay.
      function closeAddToCartOverlay() {
        $('#add-to-cart-overlay').fadeOut('slow');
        $('.add-cart-message-wrapper').css('display', 'none');
      }
 
        setTimeout(closeAddToCartOverlay,2000);
            }
  };
})(jQuery, Drupal, this, this.document);

but it isn't good way

best regards,
savage