var interval = 5; // delay between rotating images (in seconds)
var random_display = 0; // 0 = no, 1 = yes
interval *= 1000;

var image_index = 0;
image_list = new Array();
image_list[image_index++] = new imageItem("http://www.sauterforum.com/wp-content/themes/Sauter/images/Piano04.jpg");
image_list[image_index++] = new imageItem("http://www.sauterforum.com/wp-content/themes/Sauter/images/Piano01.jpg");
image_list[image_index++] = new imageItem("http://www.sauterforum.com/wp-content/themes/Sauter/images/Piano02.jpg");
image_list[image_index++] = new imageItem("http://www.sauterforum.com/wp-content/themes/Sauter/images/Piano03.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)
	return "url(" + 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)
{
	var new_image = getNextImage();	
	document.getElementById(place).style.backgroundImage = new_image;
	var recur_call = "rotateImage('"+place+"')";
	setTimeout(recur_call, interval);
}