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) {
		aktuelles_over = newImage("gfx/aktuelles_over.gif");
		studium_over = newImage("gfx/studium_over.gif");
		karriere_over = newImage("gfx/karriere_over.gif");
		multimedia_over = newImage("gfx/multimedia_over.gif");
		vergnuegen_over = newImage("gfx/vergnuegen_over.gif");
		city_over = newImage("gfx/city_over.gif");
		lounge_over = newImage("gfx/lounge_over.gif");
		shop_over = newImage("gfx/shop_over.gif");
		archiv_over = newImage("gfx/archiv_over.gif");
		head_bottom_over = newImage("gfx/head_bottom_over.gif");
		preloadFlag = true;
	}
}