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/* settings */
var showDuration = 6000,
    container = $('#yoga_wrapper'),
    images = container.find('img').css({"opacity":"0"}),
    currentIndex = 0;
/* worker */
var show = function() {
  $(images[currentIndex]).animate({"opacity":0});
  $(images[currentIndex = currentIndex < images.length - 1 ? currentIndex + 1 : 0]).animate({"opacity":1});
};

window.setInterval(show, showDuration);