var requestTrigger = false;


function checkOrderNumber() {
  quantity = document.forms["cart_quantity"].ordered_quantity.value;
  order_number = document.forms["cart_quantity"].ordered_order_no.value;

  if ((quantity != "") && (order_number == "" || order_number == 0)) {
    alert(invalid_order_alert);
    return false;
  } else {
    return !requestTrigger; 
  }
}