Just to confirm what others have said, I had a nice lengthy email from colgate for a similar situation. In the end I just gave it away to them and had to plead ignorance to avoid legal proceedings. They called it aggressive domain purchasing. After that I got rid of any domain with a trademark in it. The interesting point was with this ( colgate ) domain I hadn't even hosted it, thank god. Because they were looking for grounds to sue whereby I could have damaged their brands reputation. Luckily because I hadn't hosted a crappy website on it, they didnt go down that road, otherwise I would have had a problem. So I'd bin the lot if I were you.
Carl