code: function () {
                  var scripts = document.getElementsByTagName("script"),
                      libraryName = "/worldwind.";
  
                  for (var i = 0; i < scripts.length; i++) {
                      var index = scripts[i].src.indexOf(libraryName);
                      if (index >= 0) {
                          return scripts[i].src.substring(0, index) + "/";
                      }
                  }
  
                  return null;
              }
docs: Returns the URL of the directory containing the WorldWind library.
  @returns {String} The URL of the directory containing the WorldWind library, or null if that directory
  cannot be determined.