$(document).ready(function() {
  var speed = 1500;
  var pause = 3500;
  var shown = 0;

  var sets = $('.imagefade li');
  if (sets.size()) {
    $(sets.hide().get(shown)).show();

    var crossFade = function() {
      var next = (shown + 1) % (sets.length);
      $(sets.get(shown)).fadeOut(speed);
      $(sets.get(next)).fadeIn(speed);
      shown = next;
    };
    var looper = setInterval(crossFade, pause);
  }
});