function validateContact(form){
  var message = '';
  if (form.name.value == ''){
    message += "Please provide your name.\n";
  }
  if (form.phone.value == ''
      && form.email.value == ''){
    message += "Please provide a phone number or email where you can be contacted.\n";
  }

  if (message != ''){
    alert(message);
    return false;
  }
  return true;
}