I have the same problem in 1.20, can some one help me where i find where this javascrip are in 1.20.
(From a big fan of fog, fog has saved us a lot of time.)
For fog 1.20, files are located at:
fog/management/ajax/login.info.php <- Comment out entire page after <?php
fog/lib/fog/ProcessLogin.class.php <- Comment out lines 230-233 and 244