function getAppVersion() {
  appname= navigator.appName;
  appversion = navigator.appVersion;
  majorver = appversion.substring(0, 1);
  if ( (appname == "Netscape") && ( majorver >= 3 ) ) return 1;
  if ( (appname == "Microsoft Internet Explorer") && (majorver >= 4) ) return 1;
  return 0;
}

a1 = new Image(); a1.src="img/li3.gif";
a2 = new Image(); a2.src="img/li2.gif";
a3 = new Image(); a3.src="img/li4.gif";
a4 = new Image(); a4.src="img/li5.gif";
function swtch(i,img)
{
  if (getAppVersion()) {
	i.src=img.src;	}
}