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function _phptemplate_variables($hook, $vars = array()) {
  switch ($hook) {
    // Send a new variable, $has_terms, to see wether the current node has any terms
    case 'node':
	
      if(count(taxonomy_node_get_terms($vars['node']->nid))) {
        $vars['has_terms'] = TRUE;
      } else {
        $vars['has_terms'] = FALSE;
      }
      
      if ($vars['teaser']) {
        $vars['template_files'][] = 'node-teaser';
        $vars['template_files'][] = 'node-teaser-'. $vars['node']->type;
      }

  }
  
  return $vars;
}