code: function(item, arr) {
                  for (var i = 0; i < arr[LEXICON.l]; i++)
                      //Sometiems in IE a "SCRIPT70" Permission denied error occurs if HTML elements in a iFrame are compared
                      try {
                          if (arr[i] === item)
                              return i;
                      }
                      catch(e) { }
                  return -1;
              }
docs: Checks whether a item is in the given array and returns its index.
  @param item The item of which the position in the array shall be determined.
  @param arr The array.
  @returns {number} The zero based index of the item or -1 if the item isn't in the array.