Drupal theme() problem

[pajdo]

I am trying to display a custom page the same as my search results page by re-using the theme functions and pre-processors built into the search module.With an empty Drupal cache this works beautifully. I simple call \[code\]theme('search_results', $results, 'node' );\[/code\]with a correctly popuated results array, and I get back formatted markup.Great.However, when the cache is not clear, the search module is not available and so the theme() call goes nowhere and returns an empty string.I've tried drupal_load('module','search') which makes the module file available, but does not intialize its hook_theme.