public function indexAction() {
        $request = $this->getRequest();
        if (!$request->getParam('id') || !$request->getParam('chunk')) {
            throw new Exception('Not enough parameters: "id" and "chunk" are required.');
        }
        $bb = $this->_initBrowsebox($request);
        $this->view->bb = $bb;
        $this->_helper->layout->setLayout('blank');
    }