function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

function preloadImages() {
	if (document.images) {
		architektur = newImage("mainassets/architektur-on.gif");
		studio = newImage("mainassets/studio-on.gif");
		industrie = newImage("mainassets/industrie-on.gif");
		food = newImage("mainassets/food-on.gif");
		reisen = newImage("mainassets/reisen-on.gif");
		luftaufnahmen = newImage("mainassets/luftaufnahmen-on.gif");
		picarchitektur = newImage("mainassets/pichover-architektur.gif");
		picstudio = newImage("mainassets/pichover-studio.gif");
		picindustrie = newImage("mainassets/pichover-industrie.gif");
		picfood = newImage("mainassets/pichover-food.gif");
		picreisen = newImage("mainassets/pichover-reisen.gif");
		picluftaufnahmen = newImage("mainassets/pichover-luftaufnahmen.gif");
		}
}