var bNetscape4plus = (navigator.appName == "Netscape" && navigator.appVersion.substring(0,1) >= "4");
var bExplorer4plus = (navigator.appName == "Microsoft Internet Explorer" && navigator.appVersion.substring(0,1) >= "4");

function swapImage(url,img, onoff) {
	document.images[img].src = url + img + (onoff == 1 ? "_on.gif" : "_of.gif");
	return false;
}