/* PRIVATE Functions */
function isNN4(){
  if(!navigator.appName || !navigator.appVersion) return 0;
  return (navigator.appName=="Netscape" && navigator.appVersion.indexOf("4.")==0)
}

function isIE4(){
  if(document.all) return 1;
  return 0;
}

function isIE5(){
  return (isIE4() && document.getElementById);
}

/* PUBLIC Functions */
function checkSupportedBrowser() {
  if(isNN4()){/* location.href="/errors/unsupported.html" */ alert("Unsupported Browser");}
}