You're welcome for the mouse advice.
However...
Just because you got it from Google and it doesn't appear to have a copyright doesn't mean its free property for the taking. The proper thing to do is ask for permission to use the image from the owner, who in this case happens to be Jimmy Johnson. If it were my image you stole, I'd do everything within my power to get you removed from this forum.
Haven't you learned about plagarism yet in school? Its wrong, illegal, and can get you into serious trouble. Online, look at what's happened to people illegally downloading music, you can actually get sued if you're one of the bigger downloaders. Pictures function the same, imho.
You may think its a simple case of 'borrowing', but it goes much farther than that. We're just trying to point out the fact that what you're doing could possibly get you removed from the forum if Rich happens to not agree with your "deal with it" stance.
If you play with fire, don't be surprised if you get burned. Btw, didn't you get into trouble for this very same "avatar borrowing" activity a few months ago?