function init(directory_name,default_dir){
	if(!default_dir){
		image_dir = directory_name;
	}
	buildArray();	
	rotateImage('rImage');
}

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, number_of_image-1);
	} else {
		ImageNum = (ImageNum+1) % number_of_image;
	}
	var new_image = get_ImageItemLocation(imageArray[ImageNum]);
	return(new_image);
}

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

function prevImage(place) {
	var new_image = getPrevImage();
	document[place].src = new_image;
}

function nextImage(place) {
	var new_image = getNextImage();
	document[place].src = new_image;
}

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

/**
 * Used to select a timeframe from a drop down menu.
 *
 * @param String place  ID of the photo.
 */
function viewImage(place,selObj) {
	var num = selObj.options[selObj.selectedIndex].value;
	ImageNum = num % number_of_image;
	//alert(ImageNum);
	var new_image = get_ImageItemLocation(imageArray[ImageNum]);;
	document[place].src = new_image;
	//var recur_call = "rotateImage('"+place+"')";
	//timerID = setTimeout(recur_call, interval);
}