function check_form() {
if (my_form.FullName.value == '') {
  alert('You have entered your name');
  return false;
}
if (my_form.EmailAddress.value == '') {
  alert('You have not entered a valid E-mail Address');
  return false;
}
if (my_form.EmailAddress2.value == '') {
  alert('Please re-enter your E-mail Address');
  return false;
}
if (my_form.EmailAddress2.value !== my_form.EmailAddress.value) {
  alert('Your E-mail Addresses do not match');
  return false;
}
if (my_form.Message.value == '') {
  alert('The Message field is empty');
  return false;
}
}