main.js

var slideIndex = 0;
carousel();

/*Slideshow */
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, 3000); // Change image every 3 seconds
}


var slideIndex = 1;
showDivs(slideIndex);

/*Prev and Next buttons */
function plusDivs(n) {
  showDivs(slideIndex += n);
}

/*Prev and Next buttons */
function showDivs(n) {
  var i;
  var x = document.getElementsByClassName("mySlides");
  if (n > x.length) {slideIndex = 1}
  if (n < 1) {slideIndex = x.length}
  for (i = 0; i < x.length; i++) {
     x[i].style.display = "none";
  }
  x[slideIndex-1].style.display = "block";
}