Just Positive Karma?

[ElForro]

I'm having little problems with my users and their karma... The problem is than some users votes negative because of nothing... So i was just wondering if there's a way to only give POSITIVE karma.... So the "lower" user will have just "0" karma, and the "good" users will have a growing number...

Anny suggestions?

Thanks!

Edit: Sorry! I've just seen this Option in the Groups properties! :$