var image_index = 0;
image_list = new Array();
image_list[image_index++] = new imageItem("images/homescreen1.jpg");
image_list[image_index++] = new imageItem("images/homescreen2.jpg");
image_list[image_index++] = new imageItem("images/homescreen3.jpg");
image_list[image_index++] = new imageItem("images/homescreen4.jpg");
var number_of_image = image_list.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 generate(x, y) {
	var range = y - x + 1;
	return Math.floor(Math.random() * range) + x;
}

function getNextImage() {
	image_index = generate(0, number_of_image-1);
	var new_image = get_ImageItemLocation(image_list[image_index]);
	return(new_image);
}

function rotateImage(place) {
	var new_image = getNextImage();
	document[place].src = new_image;
	var recur_call = "rotateImage('"+place+"')";
	setTimeout(recur_call, 2000);
}

rotateImage('rImage')