If you do lose your SuperAdmin password for Joomla, don't worry because theres an easy way to get it back. Just login to your MySQL database and run this query for

Versions up to Joomla 1.0.12.

UPDATE `jos_users` SET `name` = 'admin', `password` = '21232f297a57a5a743894a0e4a801fc3' WHERE `id` =62 LIMIT 1 ;

Versions from Joomla 1.0.13 to 1.0.15

UPDATE `jos_users` SET `name` = 'admin', `password` = 'af9083d4b82dbc0745b124db3b3cf15d:M0WuLowO4rtRTddG' WHERE `id` =62 LIMIT 1 ;

Your username will now be admin and your password will be admin also.

If you're running an older version of Joomla or Mambo, you might need to change jos_users to mos_users.

If you'd like to change your password to something other than admin, go to http://www.allhype.co.uk and you can encrypt your password using MD5 - the same system Joomla uses.