// JavaScript Document

var interval = 2; // delay between rotating images (in seconds)
var random_display = 1; // 0 = no, 1 = yes
interval *= 1000;

var image_index = 0;
image_list = new Array();
image_list[image_index++] = new imageItem("images/mainpic.jpg");
image_list[image_index++] = new imageItem("images/haparanda.jpg");
image_list[image_index++] = new imageItem("images/interior.jpg");
image_list[image_index++] = new imageItem("images/sailing.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() {
	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) {
	placeimg = document.getElementById(place);
	if (placeimg) {
		var new_image = getNextImage();
		placeimg.src = new_image;
		var recur_call = "rotateImage('"+place+"')";
		setTimeout(recur_call, interval);
	}
}