Voting plugin, how to count all comment votes

sillu

I want to show the sum of each comments vote in the discussions area.
So one discussion has many comments and each comment has votes. I want the amount of those comment votes to be the vote of this whole discussion.

Idealli it would save the amount right away to the database field of the discussion itself.

I tried changing functions in the class.voting.plugin.php but it did not work. Help would be appreciated.