var bName = navigator.appName;
var bVer = parseInt(navigator.appVersion);
var NS3 = (bName == "Netscape" && bVer < 4);
var NS4 = (bName == "Netscape" && bVer == 4);
var NS5 = (bName == "Netscape" && bVer >= 5);
var IE3 = (bName == "Microsoft Internet Explorer" && bVer < 4);
var IE4 = (bName == "Microsoft Internet Explorer" && bVer >= 4);

if (NS4 || IE4) {
   if (navigator.appName == "Netscape") {
      layerStyleRef="layer.";
      layerRef="document.layers";
      styleSwitch="";
      }
   else {
      layerStyleRef="layer.style.";
      layerRef="document.all";
      styleSwitch=".style";
      }
   lBracket="[";
   rBracket="]";
   }
if (NS5) {
   layerStyleRef="layer.";
   layerRef="document.getElementById";
   styleSwitch=".style";
   lBracket="(";
   rBracket=")";
   }