var nav = (document.layers) ? true : false;
var iex = ((navigator.userAgent.indexOf("MSIE") != -1 && navigator.appVersion.substring(0,1) > 3));
var ns6 = (navigator.appName.indexOf("Netscape") !=1 && parseInt(navigator.appVersion)>=5);

function showMenu( targetId ){
if (iex){
      target = document.all( targetId );
      target.style.visibility = "visible";
      }
if (nav){
      document[targetId].visibility = "show";
      }
if (ns6){
      document.getElementById(targetId).style.visibility = "visible";
      }
}

function hideMenu( targetId ){
if (iex){
      target = document.all( targetId );
      target.style.visibility = "hidden";
      }
if (nav){
      document[targetId].visibility = "hide";
      }
if (ns6){
      document.getElementById(targetId).style.visibility = "hidden";
      }
}

function menuOn(whichmenu){
   showMenu(whichmenu); return true;
}

function menuOff(whichmenu){
   hideMenu(whichmenu); return true;
}
     
//
// Detect browser type and version
//
bName = navigator.appName;
bVer = parseInt(navigator.appVersion);
if ((bName == "Netscape" && bVer >=3) || (bName == "Microsoft Internet Explorer" && bVer >=4)) br = "n3";
else br = "n2";