paged_scroller.js

$element.on('click', '.next', function() {
  // find the next frame that isn't completely on the screen
  var $next_frame = $element.find('.frame').filter(function() {
    return $(this).position().left + $(this).width() > $element.scrollLeft() + $element.width();
  }).eq(0)

  // scroll it into view
  $element.scrollTo($next_frame, 'medium');
});