// swap images for navigation bar
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) {
		homeover = newImage("images/buttons/homeover.jpg");
		aboutover = newImage("images/buttons/aboutover.jpg");
		programover = newImage("images/buttons/programover.jpg");
		galleryover = newImage("images/buttons/galleryover.jpg");
		enrolmentover = newImage("images/buttons/enrolmentover.jpg");
		contactover = newImage("images/buttons/contactover.jpg");
		hoursover = newImage("images/buttons/hoursover.png");
		staffover = newImage("images/buttons/staffover.png");
		managementover = newImage("images/buttons/managementover.png");
		preloadFlag = true;
	}
}