function is_supervisor()
{
    return is_user_type('supervisor');
}
 /**
  * Display the user type links
  * 
  * @return boolean
  * @since 1.2
  */
 function display_user_type_links()
 {
     if (is_user_type()) {
         return false;
     }
     $pages = get_registration_pages();
     echo '<ul class="registration_types">';
     foreach ($pages as $page) {
         echo "<li><a href='?user_type={$page['role']}'><span>Register as a </span>{$page['name']}</a></li>";
     }
     echo '</ul>';
     return true;
 }