(function(wnd) {
  function animate() {
    var frame = this;
    var current = frame.querySelector("[current]");
    if(current)
      current.removeAttribute('current')
    if(current && current.previousElementSibling) {
      current.previousElementSibling.removeAttribute('previous','')
    } else {
      frame.lastElementChild.removeAttribute('previous')
    }
    if(current && current.nextElementSibling) {
      current.setAttribute('previous','')
      current.nextElementSibling.setAttribute('current','')
    } else {
      frame.firstElementChild.setAttribute('current','')
      frame.lastElementChild.setAttribute('previous','')
    }
  }
  function setup() {
    var frames = document.querySelectorAll('.slider');
    for(var i=0;i<frames.length;++i) {
      var frame = frames[i];
      var time = (+frame.getAttribute('slider-time')) || 7000;
      if(frame.getAttribute('slider-handled') == null) {
        frame.setAttribute('slider-handled','');
        setInterval(animate.bind(frame), time);
      }
    }
  }
  if(wnd.sliderAnimationSetup == undefined) {
    wnd.addEventListener('load', setup)
    wnd.sliderAnimationSetup = true;
  }
})(window);