slidesjs.update = function (element, position) {
  element.each(function () {
    var $this = $(this);
    var defaults;

      // http://www.levihackwith.com/element-dataset-not-supported-in-ie-heres-a-workaround/
      //if ($this[0].dataset === undefined) {
        defaults = $this[0].getAttribute('data-defaults');
      //} else if ($this[0].dataset.hasOwnProperty('defaults')) {
      //  defaults = $this.data('defaults');
      //}
      if (defaults) {
        if (defaults.options.aspect.rect) {
          $this.height(project.utility.getRatio.calc16x9($this.width()));
        } else if (defaults.options.aspect.sqr) {
          $this.height(project.utility.getRatio.calc4x3($this.width()));
        } else if (defaults.options.columns) {
          $this.height(Math.floor($this.width() / defaults.options.columns));
        }
      }

    if ($('.slidesjs-navigation', this).length) {
      var nav = $('.slidesjs-navigation', this);

      if (nav.is(':visible')) {
        var pos = Math.floor($this.height() / 2) - Math.floor(nav.height() / 2);

        if (!position) {
          nav.css('top', pos);
        } else {
          nav.css('top', position);
        }
      }
    }
  });
};