Video player that locks?

[fezzesarecool]

The one good thing about my fascinate was that the video player would lock when you hit the power button. I've got an incredible 2 now, and the built in video player doesn't do that. Is there a player that includes this functionality? My son is autistic and likes to watch movies sometimes on the phone to help him center himself a bit when things get overwhelming when we're out in the world, but is too young to not hit the softkeys and close the movie every 30 seconds or so. So it's kind of a critical feature.