The Tor Browser / file revision

 /* vim:set ts=2 sw=2 sts=2 et cin: */

 /* This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 function onButtonClick() {

   var textbox = document.getElementById("textbox");

   var contractid = (textbox.value % 2 == 0) ?

       "@test.mozilla.org/simple-test;1?impl=js" :

       "@test.mozilla.org/simple-test;1?impl=c++";

   var test = Components.classes[contractid].

       createInstance(Components.interfaces.nsISimpleTest);

   textbox.value = test.add(textbox.value, 1);

 }