// change layout

      var isHorizontal = false;

      function changeLayoutMode( $link, options ) {

        var wasHorizontal = isHorizontal;

        isHorizontal = $link.hasClass('horizontal');

        if ( wasHorizontal !== isHorizontal ) {

          // orientation change

          // need to do some clean up for transitions and sizes

          var style = isHorizontal ? 

            { height: '80%', width: $container.width() } : 

            { width: 'auto' };

          // stop any animation on container height / width

          $container.filter(':animated').stop();

          // disable transition, apply revised style

          $container.addClass('no-transition').css( style );

          setTimeout(function(){

            $container.removeClass('no-transition').isotope( options );

          }, 100 )

        } else {

          $container.isotope( options );

        }

      }