var interval = 4000;
	var random_display = 0;
	var imageDir = "instructions36001/";
	
    var imageNum = 0;
	imageArray = new Array();
	imageArray[imageNum++] = new imageItem(imageDir + "image11.jpg");
	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");
	imageArray[imageNum++] = new imageItem(imageDir + "image7.jpg");
	imageArray[imageNum++] = new imageItem(imageDir + "image8.jpg");
	imageArray[imageNum++] = new imageItem(imageDir + "image9.jpg");
	imageArray[imageNum++] = new imageItem(imageDir + "image10.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 getNextImage() {
	
	imageNum = (imageNum+1) % totalImages;

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

	function getPrevImage() {
		imageNum = (imageNum-1) % totalImages;
		var new_image = get_ImageItemLocation(imageArray[imageNum]);
		return(new_image);
	}

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