Disable full message display in ?

Okay, in Adium, I have Growl set to display whenever someone IMs me if I don't have Adium in the front. The problem is the Growl notification contains the person's screen name AND what they sent me in the message. I only want it to show their screen name. I checked all over the Growl preferences AND Adium preferences, but I have had no luck. If anyone knows the answer please detail the steps for me please.