function superchallenge_pass(form) {
  var pass = form.pass.value;
  if (pass) {
    var enc_pass = MD5(pass);
    var str = form.user.value+":"+enc_pass+":"+form.challenge.value;
    form.pass.value = MD5(str);
    return true;
  } else {
    return false;
  }
}