var interval = 2500;
	var random_display = 1;
	var imageDir = "slide_show/";
	var imageNum = 0;

	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");


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