Photo Organizer

Current:

global $theme = 'fixed theme name'
global $thm_elem = array(all_buttons, etc) [Initialized during startup]
theme_display_photo();
theme_display_navigator_box_[top|bottom]()
theme_display_slide_[top|bottom]()
print $thm_elem['button_name'];

functions use $thm_elem directly, and those functions, and a few other misc variables. There's some complication thanks to the i18n framework, but that's the gist of it.

Instead, I'd like to see:

$po_options['theme'] = 'default_theme' // can be overridden by user prefs
// in site_prolog()
$include_once "themes/$po_options[theme]/theme.php"
global $theme = new $po_options['theme']($language);

...

$theme->display_photo(...);
print $theme->element('button_name');

...etc.