Theme a specific block id I am looking for a simple and effective way to implement template for specific block IDs.

From what I read in Author information lost after saving node and Drupal 6 Template Suggestions, I came up with the following code, which doesn't seem to work:

function mytheme_preprocess_block(&amp;$vars) { 
  array_unshift($vars['template_files'], 'block-' . $vars['region'] . '-' .   filter_xss($vars['id'])); 
} 


From the Drupal documentation it should block-module-delta.tpl.php. 


Delta is the block ID, that's ok
Module? What's the module here it's a custom block created by adding a block.
Use Firebug to inspect the generated HTML to get the block name|module !