public static function registerHTMLPurifier()
 {
     if (self::$HTMLPurifierLoaded) {
         return;
     }
     require_once '/var/www/globalclassroom4/web/portal/lib/htmlpurifier/HTMLPurifier/Bootstrap.php';
     spl_autoload_register(array('HTMLPurifier_Bootstrap', 'autoload'));
     self::$HTMLPurifierLoaded = true;
 }