function randomHeaderImage() {
	numberOfImagesToRotate = 5;
	firstPart = '<img id="Header Image" src="http://www.stlawu.edu/images/home0';
	var imageNumber = Math.ceil(Math.random() * numberOfImagesToRotate);
	lastPart = '.jpg" >';
	document.write(firstPart + imageNumber + lastPart);
}