var interval = 3000;
        var random_display = 0;
        var imageDir = "Photos/";

        var imageNum = 0;
        imageArray = new Array();
        imageArray[imageNum++] = new imageItem(imageDir + "Image0.jpg");

        imageArray[imageNum++] = new imageItem(imageDir + "Image1.jpg");
        imageArray[imageNum++] = new imageItem(imageDir + "Image2.jpg");
        imageArray[imageNum++] = new imageItem(imageDir + "Image3.jpg");
        imageArray[imageNum++] = new imageItem(imageDir + "Image4.jpg");
        imageArray[imageNum++] = new imageItem(imageDir + "Image5.jpg");
        imageArray[imageNum++] = new imageItem(imageDir + "Image6.jpg");

        var totalImages = imageArray.length;

        function imageItem(image_location) {
            this.image_item = new Image();
            this.image_item.src = image_location;
        }
        function get_ImageItemLocation(imageObj) {
            return (imageObj.image_item.src)
        }

        function randNum(x, y) {
            var range = y - x + 1;
            return Math.floor(Math.random() * range) + x;
        }

        function getNextImage() {
		if (random_display) {
			imageNum = randNum(0, totalImages-1);
		}
		else {
			imageNum = (imageNum+1) % totalImages;
		}

		var new_image = get_ImageItemLocation(imageArray[imageNum]);
		return (new_image);
        }

        function switchImage(place) {
            var new_image = getNextImage();
            document[place].src = new_image;
            var recur_call = "switchImage('" + place + "')";
            timerID = setTimeout(recur_call, interval);
        }