if (navigator.appVersion.substring(0,1) >= "4") {
	active=new Image();
	inactive=new Image(); 
	active.src="./img/pfeil_a.gif";
	inactive.src="./img/pfeil_i.gif";
}

function on(bnum) {
	if (navigator.appVersion.substring(0,1) >= "4")
		document.images['b' + bnum].src=active.src;
}

function off(bnum) {
	if (navigator.appVersion.substring(0,1) >= "4")
		document.images['b' + bnum].src=inactive.src;
}

function popup(url,width,height) {
	if (navigator.appVersion.substring(0,1) >= "4") {
		blah = "scrollbars=yes,toolbar=no,height=" + height + ",width=" + width;
		ipwindow = open("","prewindow",blah);
		ipwindow.location.href = url;
	}
}

if (navigator.appVersion.substring(0,1) < "4")
	alert("Sorry man, you need one of the new Browsers! Go ahead and download Netscape 4.x!");