protected function removeJs($js)
    {
        $key=array_keys($this->data['js']['internal'],$js);
        if($key){
            array_splice($this->data['js']['internal'],$key[0],1);
        }

        $key=array_keys($this->data['js']['external'],$js);
        if($key){
            array_splice($this->data['js']['external'],$key[0],1);
        }
    }