mute internal speakers if headphones come out?

[spacefiesta]

I can't recall what I need to accomplish this, but I'd like to be able to mute my internal speakers in the event that my headphones come out on accident (my headphones won't securely fasten into the mac, thus have the tendency to fall out). Thanks for any help.

 

[Mikuro]

Looks like there's an app made for just that purpose: http://www.macupdate.com/info.php/id/29113/speaker-mute

And this might be useful, too, although it seems it's only for iTunes, not all audio: http://www.macupdate.com/info.php/id/23361/breakaway