text: //= require jquery-2.1.4
  $(function() {
    var body = $('html');
    var backgrounds = ['url(assets/sky.jpg)', 'url(assets/sky1.jpg)','url(assets/sky2.jpg)','url(assets/sky3.jpg)'];
    var current = 0;
  
  function nextBackground() {
    body.css(
     'background-image',
      backgrounds[current = ++current % backgrounds.length]
   );
  
   setTimeout(nextBackground, 10000);
   }
   setTimeout(nextBackground, 10000);
     body.css('background-image', backgrounds[0]);
   });