var interval = 3000;
var random_display = 0;
var imageDir = "images/web/";

var imageNum = 0;
imageArray = new Array();

imageArray[imageNum++] = new imageItem(imageDir + "bay4400-R1-020-8A_web.jpg");

imageArray[imageNum++] = new imageItem(imageDir + "B2004-Guards_Entrance_tn.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "bay4400-R1-050-23A_web_tn.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "B2004-Mary_Donkey_tn.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "B2004-Kings_Camp_tn.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "baynes4-R1-021-9_web_tn.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "baynes4-R1-033-15_web_tn.jpg");

imageArray[imageNum++] = new imageItem(imageDir + "bay4400-R1-026-11A_web.jpg");

imageArray[imageNum++] = new imageItem(imageDir + "bay4400-R3-048-22A_web.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "bay4400-R2-016-6A_web.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "bay4400-R5-012-4A_web.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 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);
}