function isValidEmail(emailAddress) {
  if (emailAddress.indexOf('@') < 1 ||
     (emailAddress.indexOf('.',emailAddress.indexOf('@')+2) < 0 ) ||
     (emailAddress.length < emailAddress.indexOf('.',emailAddress.indexOf('@')+2) + 3 )) {
    return false;
  }
  else {
    return true;
  }
}