var interval = 1800;
	var random_display = 0;
	var imageRep = "/images.lectures/";
    
	var imageNum = 0;
	imageArray = new Array();
	imageArray[imageNum++] = new imageItem(imageRep + "1_valerie_delbore.jpg");
	imageArray[imageNum++] = new imageItem(imageRep + "2_carole_bergen.jpg");
 imageArray[imageNum++] = new imageItem(imageRep + "10_carole_bergen.jpg");
	imageArray[imageNum++] = new imageItem(imageRep + "6_carole_bergen.jpg");
	imageArray[imageNum++] = new imageItem(imageRep + "4_carole_bergen.jpg");
	imageArray[imageNum++] = new imageItem(imageRep + "v_lutecia_h_B.jpg");
   imageArray[imageNum++] = new imageItem(imageRep + "carole_cours4_B.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 replaceImage(place) {
		var new_image = getNextImage();
		document[place].src = new_image;
		var recur_call = "replaceImage('"+place+"')";
		timerID = setTimeout(recur_call, interval);
        }