Not TV as monitor... I just got a new widescreen monitor for my desktop, and so I have a 19" regular LCD sitting around doing nothing. I'd like to use it as a second TV, for my bedroom or something. Is there a cable out there that'll convert a regular composite video cable to a DVI input? I found Component-to-DVI cables... but I haven't found a regular RCA-video composite to DVI cable/adaptor yet... Anyone know if it even exists?