var interval = 20; // delay between rotating images (in seconds)
var random_display = 1; // 0 = no, 1 = yes
interval *= 1000;

var image_index = 0;
var image_list = "";
var number_of_image = 0;

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() {
if (random_display) {
image_index = generate(0, number_of_image-1);
}
else {
image_index = (image_index+1) % number_of_image;
}
var new_image = get_ImageItemLocation(image_list[image_index]);
return(new_image);
}
function rotateImage(place) {
getImageList();
var currentImages = new Array(4)

var new_image_counter = 0
do
{
	var new_image = getNextImage();
	if (ArrayGetIndex(currentImages, new_image) == -1)
	{
		currentImages[new_image_counter] = new_image;
		new_image_counter ++;
	}
}while(new_image_counter <4)
//debug(currentImages);
for(x=0;x<=3;x++)
{
	document[place + new String(x)].src = currentImages[x];
}
var recur_call = "rotateImage('"+place+"')";
setTimeout(recur_call, interval);
}

function getImageList()
{
	src = new String(document.forms[0].images.value);
	image_list = src.split(", ");
	number_of_image = image_list.length;
	for (index =0;index< image_list.length;index++)
	{
		image_list[index] = new imageItem(image_list[index])
	}
}
function ArrayGetIndex(arrayitem , getitem)
{
	var i
	for(i = 0 ; i < arrayitem.length ; i++)
	{
		if(arrayitem[i] == getitem)
		{
			return(i)
		}
	}
	return(-1)
}
function debug(arr)
{
	var msg = "";
	for (y=0;y<arr.length;y++)
	{
		msg = msg + arr[y] + "\n"
	}
	alert(msg)
}