comment plugger problem

I tried installing first this ( http://wiki.wordpress.org/?pagename=Comment%20Plugger ) comment plugger, and then this ( http://mtdewvirus.com/code/wordpress-plugins/ ) comment plugger. neither of them work. I believe I installed them correctly, but when I put the code into my index file, I get the following error:

Fatal error: Call to undefined function: mdv_comment_plugger() in /home/thearwen/public_html/wp-content/themes/octopus/index.php on line 14

how do I fix this? thanks.