// JavaScript Document

var imageNum = 0;
imageArray = new Array();
imageArray[imageNum++] = new imageItem(imageDir + "fellows1.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "fellows2.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "fellows3.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "fellows4.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "fellows5.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "fellows6.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);
}