Something

keypressListener: function keypressListener(aEvent)
  {
    if (!/mac/i.test(navigator.platform) && !aEvent.altKey ||
        /mac/i.test(navigator.platform) && !aEvent.ctrlKey  ) {
      return;
    }

    aEvent.stopPropagation();
    aEvent.preventDefault();

    var key = String.fromCharCode(aEvent.charCode);

    switch (key) {
      case "b":
      case "i":
      case "u":
      case "s":
        RTSE.editor.insertTag(key);
        break;
      case "p":
        RTSE.editor.insertTag("img");
        break;
      case "q":
        RTSE.editor.insertTag("quote");
        break;
      case "l":
        RTSE.editor.link();
        break;
      default:
        break;
    }
  },