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) {
		preloadFlag = true;
	}
}

preloadImages('images/nav/nav-HOME-over.gif','images/nav/nav-RW-over.gif','images/nav/nav-FIG-over.gif','images/nav/nav-SCAPES-over.gif','images/nav/nav-STRUCT-over.gif','images/nav/nav-SURF-over.gif','images/nav/nav-VEHICLES-over.gif','images/nav/nav-ARTIST-over.gif');