function validateLoginForm (formName) {
  checkEmail = document.forms[formName].elements["loginEmail"].value;
  checkPassword = document.forms[formName].elements["loginPassword"].value;

  if (checkEmail == "") {
    alert('Please fill in your e-mail/username');
    return false;
  }
  else if (checkPassword == "") {
    alert('Please fill in your password');
    return false;
  }

  return true;
}