if (document.images) {
	var img1on = new Image();
	img1on.src = "bilder/hoerauswahl_an.gif";

	var img1off = new Image();
	img1off.src = "bilder/hoerauswahl_aus.gif";
}





function imgOn(imgName) {
	if (document.images) {
         	document.images[imgName].src = eval(imgName + "on.src");
                 }
            }

function imgOff(imgName) {
	if (document.images) {
         	document.images[imgName].src = eval(imgName + "off.src");
                 }
}