Keyboard volume buttons disabling on winamp

[jerzum]

Hello. I'm having this little problem with keyboard's volume buttons. If i hit volume up or -down button, of course the system volume gets lower or higher, but winamp does this too. Is there a way to disable this? I would like to keep the other buttons (next track etc.) working.

I tried to search before posting, i'm sorry if there was already a question like this.