$scheme = $cookies{'skin'}
        ? ( ( param( 'scheme' )
          and param( 'scheme' ) =~ /^\w{1,6}$/ )
            ? param( 'scheme' )
            : $cookies{'skin'}->value )
        : ( ( param( 'scheme' )
          and param( 'scheme' ) =~ /^\w{1,6}$/ )
            ? param( 'scheme' )
            : 'default' );