I'm hooking up my XBox to my Mitsubishi WT-46809 (HDTV-ready 16:9). I bought the XBox HDTV adapter and am running component video from the XBox into the TV. On the back of the TV, I have "Component Inputs" with "YPrPb". They are marked 480i/480p. I also have inputs for "DTV" with "YPrPb/GRBHV". They are marked 480i/480p/1080i. These include two additional RCA hook-ups labeled H&V. Which do I use? What are the "H&V" for? Thank you in advance.