var interval = 4000; 
var random_display = 0;
var imagePath = "/images/header/"
var imageCount = 0;

imageGroup = new Array();
imageGroup[imageCount++] = new imageElement(imagePath + "runner.jpg");
imageGroup[imageCount++] = new imageElement(imagePath + "bikers.jpg");
imageGroup[imageCount++] = new imageElement(imagePath + "climber.jpg");
imageGroup[imageCount++] = new imageElement(imagePath + "family.jpg");
imageGroup[imageCount++] = new imageElement(imagePath + "soccer.jpg");
imageGroup[imageCount++] = new imageElement(imagePath + "kitchenknife.jpg");
imageGroup[imageCount++] = new imageElement(imagePath + "snowmobile.jpg");
imageGroup[imageCount++] = new imageElement(imagePath + "snowboard.jpg");

var number_of_image = imageGroup.length;

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

function get_imageElementLocation(imageObj) {
	return(imageObj.image_item.src)
}

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

function getNextImage() {
	if (random_display) {
	imageCount = randNum(0, number_of_image-1);
	}
	else {
		imageCount = (imageCount+1) % number_of_image;
	}

	var new_image = get_imageElementLocation(imageGroup[imageCount]);
	return(new_image);
}

function getPrevImage() {
	imageCount = (imageCount-1) % number_of_image;
	var new_image = get_imageElementLocation(imageGroup[imageCount]);
	return(new_image);
}

function prevImage(place) {
	var new_image = getPrevImage();
	document[place].src = new_image;
}

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