if (document.images) {
	var headerImages = new Array()
	headerImages[0] = 'http://www.ostomy.org/images/template/header-1.jpg';
	headerImages[1] = 'http://www.ostomy.org/images/template/header-2.jpg';
	headerImages[2] = 'http://www.ostomy.org/images/template/header-3.jpg';
	headerImages[3] = 'http://www.ostomy.org/images/template/header-4.jpg';
}
function chooseHeaderImage() {
	if (document.images) {
		var p = headerImages.length;
		chosenImage = Math.min(Math.floor(Math.random()*p),p-1);
		document.Header_Image.src = headerImages[chosenImage];
	}
}