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

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