if(top.frames.length > 0) {
  var b = (navigator.appName=="Microsoft Internet Explorer") ? "ie":"ns";
  var v = parseInt(navigator.appVersion);
  var ok = v > 3 || (v == 3 && b == "ns");
  if(ok) { top.location.replace(self.location) }
  else   { top.location.href=self.location }
}