var hostName = "/";
    
  var IE4 = false;
  var NS4 = false;
  var ismac = false;
  var isopera = false;
  
  var browserName;
  var isMacOS = false;
  
  browserName = navigator.userAgent;
  //alert(browserName);
  if (browserName.indexOf("Mac") > 0)
     isMacOS = true;
 
  IE4 = true;