Quick question. Got my son a PS3 for Christmas. Got it hooked up to an older Sony 42" LCDRP that only has 1 HDMI input which is being used by the cable box so we can get HD. Is there some kind of splitter that allows 2 devices to use 1 input? I was checking out MP and every splitter I saw appeared to be designed to spit a signal to multiple sets, not the other way around.