Index: includes/theme.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/theme.inc,v
retrieving revision 1.422
diff -u -r1.422 theme.inc
--- includes/theme.inc	6 May 2008 12:18:45 -0000	1.422
+++ includes/theme.inc	10 May 2008 13:31:13 -0000
@@ -1922,3 +1922,16 @@
   $variables['template_files'][] = 'block-' . $variables['block']->module . '-' . $variables['block']->delta;
 }
 
+/**
+ * Returns a relative path from base to a file in the currently 
+ * selected theme. Useful for providing relative paths to files 
+ * in the theme directory.
+ * 
+ * @param $path
+ *   The path relative to the theme directory.  
+ *   
+*/
+function base_path_to_theme($path) {
+  return base_path() . path_to_theme() . "/$path" ;
+}
+