$override_field=$this->_render_radio_field($display_type,'override_thumbnail_settings',__('Override thumbnail settings','nggallery'),isset($display_type->settings['override_thumbnail_settings'])?$display_type->settings['override_thumbnail_settings']:FALSE,__('This does not affect existing thumbnails; overriding the thumbnail settings will create an additional set of thumbnails. To change the size of existing thumbnails please visit \'Manage Galleries\' and choose \'Create new thumbnails\' for all images in the gallery.','nggallery'));