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/**
 * Implements hook_theme_registry_alter()
 * Loads templates from the tpl folder of this module into theme registry
 */
 function MODULENAME_theme_registry_alter(&$registry){
   $path = drupal_get_path('module', 'MODULENAME').'/tpl';
   $current_theme = variable_get('theme_default','none');
   _theme_process_registry($registry, 'phptemplate', 'theme_engine', $current_theme, $path);
 }