Hello, I looked how to theme search forma but usual metods ( http://drupal.org/node/45295 , http://api.drupal.org/api/file/modules/search/search-theme-form.tpl.php ) are not good this time for me.

I need to place a simple form inside a block with some HMTL. I think on doin' it:
<form action="/search/node/"></form>

But I don't know how to place a text input that adds the parameter after /search/node/parameter_to_search (clean_url not as a parameter)

Is there an easier way to do this?
I tryed' callin' a search_theme function withouot luck.

Thank's for all!