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

          function display(id, str) {
            if (NS4 || IE4) { // if browser supports style sheets
              if (NS4) { // if Navigator 4.0+
                with (document[id].document) {
                  open(); // open document
                  write(str); // write to document
                  close(); // close document
                }
              } else { // Internet Explorer 4.0+
                document.all[id].innerHTML = str; // "assign" to element
              }
            }
          }

          function swapClass(text, spName, urlName, oldName, clName, over) {
            if (bVer < 4) { // old browser
              return; // terminate the function
            }  

            // create a new string for the link
            // change the link's class to clName (it was oldName before)
            var str = "<A CLASS='" + clName + "' HREF='" + urlName + "'";
            if (over) {
              // replace onMouseOver with onMouseOut
              // replace true with false
              str += " onMouseOut=\"swapClass(\'" + text + "\', \'" + spName +
                     "\', \'" + urlName + "\', \'" + clName +
                     "\', \'" + oldName + "\', false)\">";
            } else {
              // replace onMouseOut with onMouseOver
              // replace false with true
              str += " onMouseOver=\"swapClass(\'" + text + "\', \'" + spName +
                     "\', \'" + urlName + "\', \'" + clName +
                     "\', \'" + oldName + "\', true)\">";
            }
            over = "";
            str += text + "</A>";
            display(spName, str); // update the code
          }