[support] theme preprocessing - path issue

[Ursula Pieper]

I am trying to add an additional logo to my D7 site.
I added to the template.php the following:

function mytheme_preprocess_page(&$variables, $hook) {
  $theme_path = drupal_get_path('theme', variable_get('theme_default',
NULL));
  $variables['second_logo'] = $base_path . '/' . $theme_path .
'/images/second_logo.png';
}

and on page.tpl.php, I use the variable $second_logo, which correctly goes
to:
http://example.com/drupal_site/sites/all/themes/mytheme/images/second_logo.png

This works fine for the home page:

http://example.com/*drupal_site*
/sites/all/themes/mytheme/images/second_logo.png

However, when I am looking at a content page:
http://example.com/drupal_site/content/whateverpage

The url for the second logo gets constructed as:
http://example.com/drupal_site/*content*
/sites/all/themes/mytheme/images/second_logo.png

So, I add the base path to template.php:

$base_path = drupal_get_path('theme', variable_get('base_path', NULL));
$theme_path = drupal_get_path('theme', variable_get('theme_default', NULL));
$variables['second_logo'] = $base_path . '/' . $theme_path .
'/images/second_logo.png';

base_path, according to http://api.drupal.org/api/drupal/globals/7 is
supposed to bet the base of the Drupal installation, which in my case is
http://example.com/drupal_site/

However, the path for the second logo gets constructed as:
http://example.com/sites/all/themes/mytheme/images/second_logo.png

instead of

http://example.com/*drupal_site*
/sites/all/themes/mytheme/images/second_logo.png

 D7.15, zen 7.15 sub-theme.

What am I don't wrong?

Thanks, Ursula
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