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) {
		wir_over = newImage("images/wir-over.gif");
		pressemitteilungen_over = newImage("images/pressemitteilungen-over.gif");
		leistungen_over = newImage("images/leistungen-over.gif");
		referenzkunden_over = newImage("images/referenzkunden-over.gif");
		referenzen_over = newImage("images/referenzen-over.gif");
		partner_over = newImage("images/partner-over.gif");
		presse_over = newImage("images/presse-over.gif");
		kontakt_over = newImage("images/kontakt-over.gif");
		downloads_over = newImage("images/downloads-over.gif");
		veroeffentlichungen_over = newImage("images/veroeffentlichungen-over.gif");
		eventbereich_over = newImage("images/eventbereich-over.gif");
		bauprojekte_over = newImage("images/bauprojekte-over.gif");
		preloadFlag = true;
	}
}