Theme functions allow Drupal themes to alter module output before display. They provide a default style that theme builders can modify cleanly and easily. Template files generate output directly, while functions build a single variable and return it, making functions easier to use when more control structures are needed than plain HTML allows.

1. Drupal 6 Theme Functions
by Blake Lucchesi
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2. Tools
Drupal 6.x Installation
Firefox
Firebug extension for Firefox
Devel Module
Text Editor
Other Modules: admin_menu
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3. Theme Functions?
Functions that are declared as theme functions allow
the Drupal theme to alter output before presentation.
Modules can provide a default output style and allow
advanced theme builders to CLEANLY and EASILY
modify their output.
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7. Theme Developer Module
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