//Start JS function for rotating images.
var interval = 4.0; // delay between rotating images (in seconds)
var random_display = 0; // 0 = no, 1 = yes
interval *= 1000;

//Set up first image array.
var image_index = 0;
image_list = new Array();
image_list[image_index++] = new imageItem("images/porthole-steamboat.gif");
image_list[image_index++] = new imageItem("images/porthole-St-Michael.gif");
image_list[image_index++] = new imageItem("images/porthole-topdeck.gif");
image_list[image_index++] = new imageItem("images/porthole-wedding.gif");
image_list[image_index++] = new imageItem("images/porthole-eating.gif");
image_list[image_index++] = new imageItem("images/porthole-inside-dinning.gif");
image_list[image_index++] = new imageItem("images/Porthole-Lighthouse.gif");

//Set up second image array.
var image_index2 = 0;
image_list2 = new Array();
image_list2[image_index++] = new imageItem("images/Porthole-Lighthouse.gif");
image_list2[image_index++] = new imageItem("images/porthole-inside-dinning.gif");
image_list2[image_index++] = new imageItem("images/porthole-eating.gif");
image_list2[image_index++] = new imageItem("images/porthole-wedding.gif");
image_list2[image_index++] = new imageItem("images/porthole-topdeck.gif");
image_list2[image_index++] = new imageItem("images/porthole-St-Michael.gif");
image_list2[image_index++] = new imageItem("images/porthole-steamboat.gif");

//Set up third image array.
var image_index2 = 0;
image_list3 = new Array();
image_list3[image_index++] = new imageItem("images/Porthole-Lighthouse.gif");
image_list3[image_index++] = new imageItem("images/porthole-inside-dinning.gif");
image_list3[image_index++] = new imageItem("images/porthole-topdeck.gif");
image_list3[image_index++] = new imageItem("images/porthole-wedding.gif");
image_list3[image_index++] = new imageItem("images/porthole-eating.gif");
image_list3[image_index++] = new imageItem("images/porthole-St-Michael.gif");
image_list3[image_index++] = new imageItem("images/porthole-steamboat.gif");

//Test the length of all 3 arrays.
var number_of_image = image_list.length;
var number_of_image2 = image_list2.length;
var number_of_image3 = image_list3.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) 
{
	var new_image = getNextImage();
	document[place].src = new_image;
	var recur_call = "rotateImage('"+place+"')";
	setTimeout(recur_call, interval);
}
//End JS function for rotating images.