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) {
		introsmall_over = newImage("images/nav/introsmall-over.jpg");
		linksmall_over = newImage("images/nav/linksmall-over.jpg");
		introsmall_over = newImage("images/nav/introsmall-over.jpg");
		diagramsmall_over = newImage("images/nav/diagramsmall-over.jpg");
		gallerysmall_over = newImage("images/nav/gallerysmall-over.jpg");
		contactsmall_over = newImage("images/nav/contactsmall-over.jpg");
		eventsmall_over = newImage("images/nav/eventsmall-over.jpg");
		preloadFlag = true;
	}
}