var interval = 4; // delay between rotating images (in seconds)
interval *= 1000;

image_list = new Array();
image_list[0] = new imageItem("images/edin_hp_wind.jpg");
image_list[1] = new imageItem("images/edin_hp_geothermal.jpg");
image_list[2] = new imageItem("images/edin_hp_solar.jpg");
//image_list[3] = new imageItem("images/edin_hp_buildings.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);

	new_image = new Image();
	new_image = get_ImageItemLocation(image_list[image_index]);
	return(new_image);
}

function rotateImage(placeA) {
	new_image = new Array();
	new_image = getNextImage();
	
	//alert('DEBUG:'+'...);

    document.getElementById(placeA).src = new_image;

	var recur_call = "rotateImage('"+placeA+"')";
	setTimeout(recur_call, interval);
}