method i18n_get_normal_path is missing

while trying the following php block

 //get listed links of languages
  $query = drupal_query_string_encode($_GET, array('q'));
  print theme('item_list', i18n_get_links($_GET['q'], empty($query) ? NULL : $query));
  

i encountered the exception
Fatal error: Call to undefined function i18n_get_normal_path() in C:\php\drupal-6.2\sites\all\modules\i18n\i18n.module on line 661
i searched the complete i18n module and found actually not implementation of the method.