// JavaScript Document

var interval = 2.5; //THE TIME DELAY BETWEEN IMAGES IN SECONDS;


var nonRotate = 4; //NUMBER OF IMAGES THAT ALWAYS PLAY IN THE BEGINNING IN THE SAME ORDER; IN THIS CASE THE FIRST 4 IMAGES WILL ALWAYS PLAY IN THE BEGINNING IN THE SAME ORDER;


var totalImages = 14;//TOTAL NUMBER OF IMAGES
interval *= 1000;
var i =0;
var image_index = 0;
image_list = new Array();

function imageItem(image_location)
{
	this.image_item = new Image();
	this.image_item.src = image_location;
}

function setArray()
{
	var dir_root = "http://conquercancer.ca/images/rtcc11/to_sponsors/";

	for(j=0; j<totalImages; j++)
	{
		image_list[j] = new imageItem(dir_root+[j+1]+".gif");		
	}

}

setArray();

var number_of_image = image_list.length;



function generate(x, y)
{
	var range = y - x + 1;
	return Math.floor(Math.random() * range) + x;
}

function getNextImage()
{
	
	if (i<nonRotate)
	{
		i++;
	}
	else if(i>=nonRotate && i<totalImages)
	{	
		image_index = generate(0, number_of_image-1);
		i++;	
	}
	else if(i>=totalImages)
	{ 	
		setArray();
		i=0;
		image_index=0;
		i++;
	}
	
	var new_image = image_list[image_index].image_item.src;
	image_list.splice(image_index,1);
	number_of_image= image_list.length;
	return(new_image);

}

function rotateImage(img)
{
	var new_image = getNextImage();
	document[img].src = new_image;
	var recur_call = "rotateImage('"+img+"')";
	setTimeout(recur_call, interval);
}