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) {
		btn_homeON = newImage("images/buttons/btn-homeON.gif");
		btn_inPrintON = newImage("images/buttons/btn-inPrintON.gif");
		btn_calendarON = newImage("images/buttons/btn-calendarON.gif");
		btn_cultureON = newImage("images/buttons/btn-cultureON.gif");
		btn_glossaryON = newImage("images/buttons/btn-glossaryON.gif");
		btn_bioON = newImage("images/buttons/btn-bioON.gif");
		btn_contactON = newImage("images/buttons/btn-contactON.gif");
		btn_linksON = newImage("images/buttons/btn-linksON.gif");
		btn_previewON = newImage("images/buttons/btn-previewON.gif");
		btn_photosON = newImage("images/buttons/btn-photosON.gif");
		btn_diaryON = newImage("images/buttons/btn-diaryON.gif");
		preloadFlag = true;
	}
}