$(document).ready(function() {

  var fps = 2, now, then = Date.now(), interval = 1000/fps, delta;

  function init(){
    console.log("Init");
    // preload all pictures before launching
    
    setTimeout(function(){
      play();
    }, 5000);
  };

  function play(millis){
    requestAnimationFrame(play);

    now = Date.now();
    delta = now - then;

    if(delta > interval){
      $(".frame.current", "#pictures").toggleClass('current').next().toggleClass('current');

      then = now -(delta % interval);
    }
  }




  init();

});