Customizing Offline Page

Drupal 5.x

1. Go to misc/maintenance.css.
2. Change the drupalicon.png logo in the body tag to your logo.
3. Change the padding in the body tag to fix any overlapping text on the logo.

Drupal 6.x

1. Add $conf['maintenance_theme'] = 'themeName'; to the settings.php file.
2. Copy your theme's page.tpl.php file and rename it maintenance-page.tpl.php.
3. Make any changes needed to that tpl file.