function validate_email(whatYouTyped) {
  var fieldset = whatYouTyped;
  var txt = whatYouTyped.value;
  if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(txt)) {
    fieldset.className = "";
    return(true);
  } else {
    fieldset.className = "error";
    return(false);
  }
}