function get_safari_version() {
  var sf_version = '';

  if (sf) {
    var user_agent = navigator.appVersion;
    var sf_placement = user_agent.indexOf("Safari/");
    var version_placement = sf_placement + 7;
    sf_version = parseFloat(user_agent.substring(version_placement, user_agent.length));
  }
  else {
    sf_version = 0;
  }

  return sf_version;
}

function get_netscape_version() {
  var ns_version = '';
  var user_agent = navigator.userAgent;
  var ns_placement = user_agent.indexOf("Netscape/");
  var version_placement = ns_placement + 9;
  ns_version = parseFloat(user_agent.substring(version_placement, user_agent.length));
  return ns_version;
}

var nv = get_netscape_version();
var sf = (navigator.appVersion.toString().indexOf('Safari') != -1)?1:0;
var sv = get_safari_version();
var svb13 = ((sv < 130) && (sv > 0))?1:0;

var IE = (document.all)?1:0;