var vers = navigator.appVersion;
function detectbrowser(pagetoLoad)
{
  if (navigator.appName == "Netscape") {
   if (vers.indexOf("4.") == 0) {
     location = pagetoLoad + "ns.htm"; }
   else {
     alert("Sorry. You must use Navigator 4.0 to browse this site - Mohan Iyer");
   }
  }
  else {
   if (vers.indexOf("4.") == 0) {
     location = pagetoLoad + "ie.htm"; }
   else {
     alert("Sorry. You must use IE 4.0 to browse this site - Mohan Iyer");
   }
  }
}