public function getSeriesOption( $series, $option, $default = null )
    {
        $seriesTitle = $this->getSeriesTitle( $series ); 

        return ( isset( $this->options['seriesStorage'][$seriesTitle] ) && isset( $this->options['seriesStorage'][$seriesTitle][$option] ) )
            ?  $this->options['seriesStorage'][$seriesTitle][$option]
            :  $default;
    }