code: function getZone(zone) {
          if (!zone) return "main";
          if (zone.length == 1) {
              zone = zone.replace("/^1", "main");
              zone = zone.replace("/^2", "zone2");
              zone = zone.replace("/^3", "zone3");
              zone = zone.replace("/^4", "zone4");
          }
          switch (zone) {
              case 1:
                  zone = "main";
                  break;
              case 2: case 3: case 4:
                  zone = "zone" + zone;
          }
          return zone;
      }
docs: ---- zone number to string