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/menu1.jpg";
b1 = new Image(); b1.src="img/menu1a.jpg";
a2 = new Image(); a2.src="img/menu2.jpg";
b2 = new Image(); b2.src="img/menu2a.jpg";
a3 = new Image(); a3.src="img/menu3.jpg";
b3 = new Image(); b3.src="img/menu3a.jpg";
a4 = new Image(); a4.src="img/menu4.jpg";
b4 = new Image(); b4.src="img/menu4a.jpg";
a5 = new Image(); a5.src="img/menu5.jpg";
b5 = new Image(); b5.src="img/menu5a.jpg";

function swtch(i,img)
{
  if (getAppVersion()) {
	i.src=img.src;	}
}