Drupal form submit question

[webnick]

Hi, I have a Drupal question and can't seem to get any help on the Drupal forums. Hopefully there's a savy Drupal user out there; I think this is a basic question but we need it to get going in the framework...

I should be able to add a submit function to any form, adding it when the form loads:

function mytheme_node_form($form) 
{
	if($form_id['#value'] == 'event_node_form') {
		drupal_set_message('too granular');
		$form['#submit'][mytheme_form_handler'] = array();
	}
	$output = '';
	$output .= drupal_render($form);
	return $output;
}
function mytheme_form_handler($form_id, $form_values) 
{
// ...
}

But this is not getting handeled in the API. I can look at a var_dump of the form and submit is there. Any help?

Thanks