var interval 		= 5000;
var random_display 	= 0;
var imageDir 		= "img/slideshow/";
var imageNum 		= 0;
var totalImages		= 23;

imageArray = new Array();

imageArray[imageNum++] = new imageItem(imageDir + "01.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "02.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "03.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "04.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "05.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "06.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "07.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "08.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "09.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "10.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "11.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "12.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "13.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "14.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "15.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "16.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "17.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "18.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "19.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "20.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "21.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "22.jpg");
imageArray[imageNum++] = new imageItem(imageDir + "23.jpg");

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

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

 	var new_image = get_ImageItemLocation(imageArray[imageNum]);
	return(new_image);
}

function getPrevImage() {
	imageNum = (imageNum-1) % totalImages;
	var new_image = get_ImageItemLocation(imageArray[imageNum]);
	return(new_image);
}

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

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