function testCreditCard () {
  myCardNo = document.getElementById('CreditCardNumber').value;
  myCardType = document.getElementById('CreditCardType').value;
  if (checkCreditCard (myCardNo,myCardType)) {
//    alert ("Credit card has a valid format")
	return true;	
  } 
  else {alert (ccErrors[ccErrorNo])};
  return false;
}