$this->conf->set('thumbnails.width', 125);
$this->conf->set('thumbnails.height', 90);
$this->conf->remove('thumbnail');
$this->conf->write(true);
$this->conf->set('thumbnails.width', 125);
$this->conf->set('thumbnails.height', 90);
$this->conf->remove('thumbnail');
$this->conf->write(true);