var slideIndex = 0;
    carousel();

    function carousel() {
      var i;
      var x = document.getElementsByClassName("mySlides");
      for (i = 0; i < x.length; i++) {
        x[i].style.display = "none";
      }
      slideIndex++;
      if (slideIndex > x.length) {slideIndex = 1}
      x[slideIndex-1].style.display = "block";
      setTimeout(carousel, 7000);
}