How to add settings to your theme configuration page

In the Drupal administration section, each theme has its own settings page at admin/build/themes/settings/themeName. And this page has a form with standard settings like “Logo image settings” and “Shortcut icon settings.”

In Drupal 6, theme authors can now customize this page by adding additional settings to the form. In Drupal 5, theme authors and theme users will have to install the Theme Settings API module (5.x-2.1 or later) before being able to use the method described below.