function doNothing()
{}

var appOS   = "other";
var appName = "other";
var appVer  = parseInt(navigator.appVersion);

if (navigator.appVersion.indexOf("IE 5.") != -1) {
  appVer = 5;
}

if (navigator.appName.indexOf("Netscape") != -1) {
  appName = "ns";
} else if (navigator.appName.indexOf("Microsoft") != -1) {
  appName = "ie";
} else {
  appName = "other";
}

if (navigator.appVersion.indexOf("Win") != -1) {
  appOS = "win";
} else if (navigator.appVersion.indexOf("Mac") != -1) {
  appOS = "mac";
} else {
  appOS = "other";
}