function majQuantity(qty,i)
                   {
                        quantity = document.cart_quantity['cart_quantity['+i+']'].value;
                        quantity = parseInt(quantity) + parseInt(qty)
                        if (quantity < 1)
                        {
                         quantity = 1;
                        }
                        document.cart_quantity['cart_quantity['+i+']'].value = quantity;
                   }