Instructions:
Place the function call after the line in your index.php that contains the call to the comments_popup_link function call.
<?php comment_plugger(); ?>

Configuration:
You may pass parameters when calling the function to configure some of the options.
Example: comment_plugger('Last Commented By: ', 7)

The parameters:
$before - text to be displayed before the commentors names are displayed
$limit - the maximum number of commentor names to display