if(!UDesign) {
 var UDesign = {};
}

UDesign.FudCart = {
  getCartQuantity: function() {
    new Ajax.Request('/index.php', {
      method: 'get',
      parameters: { uri: 'udesign/shoppingcart/getCartQuantity' }
      ,onSuccess: function(transport) {
        if (!isNaN(transport.responseText)) {
          $('cartcount').innerHTML = transport.responseText;
          $('cart').show();
        }
      }
    });
  }
}

UDesign.FudCart.getCartQuantity();