Mine

theme.inc

	$session =& $gallery->getSession();
        list ($detailMode, $return) = GalleryUtilities::getRequestVariables('detailMode', 'return');
        if ($detailMode != null) { 
            $session->put('theme.detailMode', $detailMode); 
            return array(GalleryStatus::success(), array('redirectUrl' => $return)); 
        } 
        $theme['detailMode'] = $session->get('theme.detailMode');