function votingapi_add_vote($content_type, $content_id, $value, $value_type = VOTINGAPI_VALUE_DEFAULT_TYPE, $tag = VOTINGAPI_VALUE_DEFAULT_TAG, $uid = NULL) {
  if ($uid == NULL) {
    global $user;
    $uid = $user->uid;
  }

  $vobj->vote_id = db_next_id('{votingapi_vote}');
  $vobj->content_type = $content_type;
  $vobj->content_id = $content_id;
  $vobj->value = $value;
  $vobj->value_type = $value_type;
  $vobj->tag = $tag;
  $vobj->uid = $uid;
  $vobj->timestamp = time();

  $vobj->hostname = $_SERVER['REMOTE_ADDR'];
  // Append internal IP if it exists.
  if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
    $vobj->hostname .= '-'. $_SERVER['HTTP_X_FORWARDED_FOR'];
  }

  db_query("INSERT INTO {votingapi_vote} (vote_id, content_type, content_id, value, value_type, tag, uid, timestamp, hostname) VALUES (%d, '%s', %d, %f, '%s', '%s', %d, %d, '%s')",
    $vobj->vote_id, $vobj->content_type, $vobj->content_id, $vobj->value, $vobj->value_type, $vobj->tag, $vobj->uid, $vobj->timestamp, $vobj->hostname);

  // Give other modules a chance to act on the insert operation.
  votingapi_invoke('insert', $vobj);

  return $vobj;
}