function wechsler(knoten, nr) {

	for (i = 0; i < document.getElementsByTagName("ul").length - 1; i++) {
		if (document.getElementsByTagName("ul")[i].className == "nav aus") {
			document.getElementsByTagName("ul")[i].className = "nav"
		}
	}

	if (nr > 0) {

		knoten.parentNode.parentNode.className = "aus";

		if (!document.all) {

			if (nr == 1) {
				knoten.parentNode.parentNode.parentNode.childNodes[1].className = "";
			} else if (nr == 2) {
				knoten.parentNode.parentNode.parentNode.childNodes[3].className = "";
			} else if (nr == 3) {
				knoten.parentNode.parentNode.parentNode.childNodes[5].className = "";
			}

		} else {

			if (nr == 1) {
				knoten.parentNode.parentNode.parentNode.childNodes[0].className = "";
			} else if (nr == 2) {
				knoten.parentNode.parentNode.parentNode.childNodes[1].className = "";
			} else if (nr == 2) {
				knoten.parentNode.parentNode.parentNode.childNodes[2].className = "";
			}

		}

	}

}

window.onload = wechsler;