Assign a node type to a menu-callback page (programmaticly)

Hi guys,

I've got a problem while converting a module to be almost programmaticly.

The module enables me to plug a download-manager-module to a drupal site easily.

My goal, where I even get troubled, is to make a site available that
provide a login site (login, passwd fields and login-button).

I've got a content-type with that I load my custom design template
by file-pattern: node-my_type.tpl (I use smarty)

To get the login site programmaticly I've got:

function omoodm_account_menu ($may_cache) 
{
  	$items = array();
  	$items[] = array (
		'path' => 'download-login',
  		'access' => TRUE,
		'title' => 'Donwload Login Site',
		'callback' => 'drupal_get_form',
		'callback arguments' => array('form_login_site_view'),
  		'type' => MENU_CALLBACK,
  	);
	return $items;
}

So I'll get a callback but I don't know how to assign my needed
content type to get the right template file loaded.

any ideas?
would be great!

thx,
melchior