function getSelectValue(id) {
  var selectObject = document.getElementById(id);
  var selectIndex = document.getElementById(id).selectedIndex;
  return selectObject.options[selectIndex].value;
}

function setInnerHTML(id, str) {
  document.getElementById(id).innerHTML = str;
}

function changePaymentAlert() {
  var method = getSelectValue("paymentmethod");
  if (method == "cash" || method == "check") {
    var alert = "<b>Please note:</b> Your order will only be ";
    alert = alert + "delivered once payment is received.  This ";
    alert += "could take several days.  Paypal or Credit Card is faster.";
    setInnerHTML("paymentmethodalert", alert);
  }
  else {
    setInnerHTML("paymentmethodalert", "");
  }
}