+ // Note that null for mode is taken to mean use default.
+ $mode = $this->getRequest()->getVal( 'gallerymode', null );
+ try {
+ $this->gallery = ImageGalleryBase::factory( $mode );
+ } catch ( MWException $e ) {
+ // User specified something invalid, fallback to default.
+ $this->gallery = ImageGalleryBase::factory();
+ }