var timerSlideShow = null;
var imageArray = new Array();
var imageCount = 0;
var imageObject = null;
var intervalSec = 5;

function nextSlide() {
  if (imageCount > imageArray.length -1) imageCount = 0;
  imageObject.src = imageArray[imageCount].src;
  imageCount += 1
  timerSlideShow = setTimeout("nextSlide()", intervalSec * 1000);
}