var imageNum = 0;
var imageDir = "_images/";

imageArray = new Array();
imageArray[0] = new imageItem(imageDir + "small1.jpg");
imageArray[1] = new imageItem(imageDir + "small2.jpg");
imageArray[2] = new imageItem(imageDir + "small3.jpg");
imageArray[3] = new imageItem(imageDir + "small4.jpg");

var total = 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 next() {
	imageNum = (imageNum+1) % total;
	var new_image = get_ImageItemLocation(imageArray[imageNum]);
	return(new_image);
}

function previous() {
	if (imageNum < 1) {
		imageNum = 3; /* SET THIS NUMBER EQUAL TO # OF IMAGES -1 */
		var new_image = get_ImageItemLocation(imageArray[imageNum]);
		return(new_image);
	}
	else {
		imageNum = (imageNum-1);
		var new_image = get_ImageItemLocation(imageArray[imageNum]);
		return(new_image);
	}
}

function previousImage() {
	var new_image = previous();
	document.base.src = new_image;
}

function nextImage() {
	var new_image = next();
	document.base.src = new_image;
}

function set0() {
	imageNum = 0
}

function set1() {
	imageNum = 1
}

function set2() {
	imageNum = 2
}

function set3() {
	imageNum = 3
}