Solved this if anybody is interested. The following code is simply combined with the above jsFiddle. Cheers.

$(window).keydown(function(e) {
   //prevent default arrow key behavior
  var $targetElement;
  //right
  if (e.keyCode == 39) {
      $targetElement = $('.active').next('div');
      e.preventDefault();
  }
  //left
  else if (e.keyCode == 37) {
      $targetElement = $('.active').prev('div');
      e.preventDefault();
  } 

  if (!$targetElement || !$targetElement.length===0) {
      return;
  }
  $('.active').removeClass('active');
  $targetElement.addClass('active');

  //scroll element into view    
  $('html, body').clearQueue().animate({
      scrollTop: $targetElement.offset().top
  }, 1000);

});​