static function enabled()
    {
        if ( isset( $GLOBALS['eZSSLZoneEnabled'] ) )
            return $GLOBALS['eZSSLZoneEnabled'];

        $enabled = false;
        $ini = eZINI::instance();
        if ( $ini->hasVariable( 'SSLZoneSettings', 'SSLZones' ) )
            $enabled = ( $ini->variable( 'SSLZoneSettings', 'SSLZones' ) == 'enabled' );

        return $GLOBALS['eZSSLZoneEnabled'] = $enabled;
    }