write javascript to create auto slideshow with 6 images

var images = ['1.png', '2.png', '3.png', '4.png', '5.png', '6.png'];
var i = 0;
var myImage = document.getElementById('myImage');
myImage.onclick = function () {
  if (i < images.length - 1) {
    i++;
  } else {
    i = 0;
  }
  myImage.src = images[i];
}