// browser requirement
var ver = parseInt(navigator.appVersion);
if (ver < 4) window.location.href = "tmx_need40.htm"; 

// browser sniffer
var myBrowser = null;
if(document.all) {
  myBrowser = "IE";
} else if(document.layers) {
  myBrowser = "NN";
} else if(document.getElementById) {
  myBrowser = "DOM";
}