Theming a spesific node differently

I'm trying to theme a spesific node differently using these instructions: http://drupal.org/node/136647

However, it doesn't seem to work.

Here is my function in template.php:

function _phptemplate_variables($hook, $vars) {
  $vars = array();
  if ($hook == 'page') {

    // These are the only important lines
    if (module_exists('page_title')) {
      $vars['head_title'] = page_title_page_get_title();
    }

  }
  if ($hook == 'node')
  	$vars['template_files'] = array('node-'. $vars['nid']);
  return $vars;
}

And I made a file called node-1.tpl.php into my theme folder but when I view it, the node-1.tpl.php is not used..

Any help appreciated!