url "javascript:
          function initialize() {
              connectKeyboard();
          }
          function shutdown() {
              disconnectKeyboard();
          }
  
          function connectKeyboard() {
              // tell what events
              oldMask = Browser.eventMask;
              Browser.eventMask = ((1<<5) | (1<<6)); // KeyUp&Down Only...
              // add event observer
              Browser.addRoute(Browser,'event_changed',me,'onEvent');
          }
          function disconnectKeyboard()
          {
              // remove event observer
              Browser.deleteRoute(Browser,'event_changed',me,'onEvent');
              Browser.eventMask = oldMask;
          }