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) {
		nav_homeo = newImage("/images/nav_homeo.gif");
		nav_menuo = newImage("/images/nav_menuo.gif");
		nav_locationso = newImage("/images/nav_locationso.gif");
		nav_cateringo = newImage("/images/nav_cateringo.gif");
		nav_ordero = newImage("/images/nav_ordero.gif");
		nav_mailo = newImage("/images/nav_mailo.gif");
		nav_cardso = newImage("/images/nav_cardso.gif");
		nav_abouto = newImage("/images/nav_abouto.gif");
		preloadFlag = true;
	}
}