I dont know how to use Xajax Comet plugin on CI

Code:
$partes_ruta = explode("index.php",$_SERVER['SCRIPT_NAME']);

        

        // XAJAX

        require_once($partes_ruta[0].'system/application/libraries/xajax/xajax_plugins/response/comet/comet.inc.php');  

        $this->load->library('xajax/xajax_core/Xajax');

        $this->xajax->registerFunction(array("empezarchat", &$this, "empezarchat"));

        $this->xajax->registerFunction(array("metermensaje", &$this, "metermensaje"));

        $this->xajax->processRequest();

        

        $datos['xajax_js'] = $this->xajax->getJavascript($partes_ruta[0].'system/application/libraries/xajax/');

        $this->load->view('vistachat', $datos);