var interval = 8000; 
var random_display = 0;
var image_dir = ""
var ImageNum = 0;
imageArray = new Array();
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "asiotufront1.jpg"),"Asio otus");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "saxtorfront.jpg"),"Saxicola torquatus");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "chlnigfront1.jpg"),"Chlidonias Niger");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "bubbubfront.jpg"),"Bubo bubo");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "strnebfront1.jpg"),"Strix nebulosa");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "asiotufront1.jpg"),"Asio otus");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "embcitfront1.jpg"),"Emberiza citrinella");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "calalpfront.jpg"),"Calidris alpina");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "vanchifront.jpg"),"Vanellus chilensis");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "jyntorfront.jpg"),"Jynx torquilla");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "aegfunfront.jpg"),"Aegolius funereus");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "motcitfront.jpg"),"Motacilla citreola");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "larfusfront.jpg"),"Larus f. fuscus");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "stuvulfront.jpg"),"Sturnus vulgaris");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "tocflafront.jpg"),"Tockus flavirostris");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "regregfront.jpg"),"Regulus regulus");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "larfusfront2.jpg"),"Larus fuscus");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "maccapfront.jpg"),"Macronyx capensis");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "galcrifront.jpg"),"Galerida cristata");
imageArray[ImageNum++] = new Array(new imageItem(image_dir + "locnaefront.jpg"),"Locustella naevia");

var number_of_image = imageArray.length;

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

function get_ImageItemLocation(imageObj) {
	return(imageObj[0].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, number_of_image-1);
	}
	else {
		ImageNum = (ImageNum+1) % number_of_image;
	}
	var new_image = get_ImageItemLocation(imageArray[ImageNum]);
	var new_title = imageArray[ImageNum][1];
	return new Array(new_image, new_title);
}

function getPrevImage() {
	ImageNum = (ImageNum-1 > -1)? ImageNum-1 : number_of_image-1;
	//ImageNum = (ImageNum-1) % number_of_image;
	var new_image = get_ImageItemLocation(imageArray[ImageNum]);
	var new_title = imageArray[ImageNum][1];
	return new Array(new_image, new_title);
}

function prevImage(place) {
	var new_image = getPrevImage();
	document[place].src = new_image[0];
	document[place].title = new_image[1];
}

function rotateImage(place) {
	var new_image = getNextImage();
	document[place].src = new_image[0];
	document[place].title = new_image[1];
	var recur_call = "rotateImage('"+place+"')";
	timerID = setTimeout(recur_call, interval);
}