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) {
		busa = newImage("menu01bus.jpg");
		teaa = newImage("menu02tea.jpg");
		enta = newImage("menu03ent.jpg");
		paca = newImage("menu04pac.jpg");
		loca = newImage("menu05loc.jpg");
		cata = newImage("menu06cat.jpg");
		deca = newImage("menu07dec.jpg");
		preloadFlag = true;
	}
}