FlexSlider Demo Javascript.html

<script type="text/javascript" charset="utf-8">
  $(window).load(function() {

    // get the total number of slides:
    var numberOfSlides = $(".slides li").size();

    // select a random number between 0 and numberOfSlides.
    var randomStart = Math.floor( Math.random() * numberOfSlides );

    $('.flexslider').flexslider({
      startAt: randomStart
    });
  });
</script>