<script>
    $(document).ready( function() {
  var $gallery = $('.slider-banner').flickity({
    prevNextButtons: false,
    pageDots: true
  });
  // Flickity instance
  var flkty = $gallery.data('flickity');
  // elements


  // previous
  var $previousButton = $('.big-prev-wrap').on( 'click', function() {
    $gallery.flickity('previous');
  });
  // next
  var $nextButton = $('.big-next-wrap').on( 'click', function() {
    $gallery.flickity('next');
  });

  // update selected cellButtons
  $gallery.on( 'cellSelect', function() {
    if ( !flkty.cells[ flkty.selectedIndex - 1 ] ) {
      $previousButton.attr( 'disabled', 'disabled' );
      $nextButton.removeAttr('disabled'); // <-- remove disabled from the next
    } else if ( !flkty.cells[ flkty.selectedIndex +1 ] ) {
      $nextButton.attr( 'disabled', 'disabled' );
      $previousButton.removeAttr('disabled'); //<-- remove disabled from the prev
    } else {
      $previousButton.removeAttr('disabled');
      $nextButton.removeAttr('disabled');
    }
  });

  // select cell on button click
  $cellButtonGroup.on( 'click', '.button', function() {
    var index = $(this).index();
    $gallery.flickity( 'select', index );
  });

});

</script>