var interval = 15000;
var random_display = 0;
var imageDir = "pics/headers/";


function zufall() {
 return (Math.random() - Math.random());
}


var imageNum = 0;
imageArray = new Array();
imageArray[imageNum++] = new imageItem(imageDir + "f_Daniel_amman.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_goldschmiedt.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_rehmann_sutter.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_siegrist.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_stamp.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_wilhelm_gruissem.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_aErhardt.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_bSchmid.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_cGessler.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_chSautter.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_rSchweizer2.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_cZwahlen.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_fBigler.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_fFelber.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_fOser.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_hBonfadelli.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_jRomeis.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_lTamm.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_mMauerhofer.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_mSander.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_phAerni.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_pMaeder.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_rGuadagnuolo.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_rSchweizer.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_stMann.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_thBoller.gif");
imageArray[imageNum++] = new imageItem(imageDir + "f_wNentwing.gif");

imageArray.sort(zufall);

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