function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		swappic = newImage("images/headpic1.jpg");
		swappic = newImage("images/headpic2.jpg");
		swappic = newImage("images/headpic3.jpg");
		swappic = newImage("images/headpic4.jpg");
		preloadFlag = true;
	}
 }


var image00_pic = new Image();
image00_pic.src = "images/headpic.jpg";
var image01_pic = new Image();
image01_pic.src = "images/headpic1.jpg";
var image02_pic = new Image();
image02_pic.src = "images/headpic2.jpg";
var image03_pic = new Image();
image03_pic.src = "images/headpic3.jpg";
var image04_pic = new Image();
image04_pic.src = "images/headpic4.jpg";

var currentImage = 0;

function startTimer() 
{
	timerID = setTimeout('swapImage()', 5000);
}

function swapImage() 
{
	currentImage++;
	if (document.images) 
	{
		document.swap_pic.src = eval('image0' + (currentImage % 5) + '_pic.src');
	}
	clearTimeout(timerID);
	startTimer();
}