Last June, a group of crackers and art hackers in what used to be Czechoslovakia hacked a webcam feed to make it look like someone had detonated a nuclear device by scaling the tower that the webcam was mounted on and patching into the network link directly, which let them inject their altered images. Coincidentally at the same moment that the webcam feed was shown by the local news. They're facing a court trial and up to three years in jail for their prank, which scared not a few people silly. They say that they did it to call into …