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) {
		oben1 = newImage("images/oben1.jpg");
		oben2 = newImage("images/oben2.jpg");
		oben3 = newImage("images/oben3.jpg");
		oben4 = newImage("images/oben4.jpg");
		oben5 = newImage("images/oben5.jpg");
		oben7 = newImage("images/oben7.jpg");
		oben8 = newImage("images/oben8.jpg");
		preloadFlag = true;
	}
}