function handle_notes()
{
    $users_events = new ES_DB_UsersEvents();
    $event = new stdClass();
    $event->ID = $_POST['event_id'];
    $user = new stdClass();
    $user->ID = $_POST['user_id'];
    $content = $_POST['content'];
    echo $users_events->update_user_reminder($user, $event, $content);
    exit;
    //always call exit at the end of a WordPress ajax function
}