I'm presenting a training session in a hotel conference room that has a wall-mounted HD television. My original idea was to bring my Apple TV box along, connect it to the television, then share my MBA desktop wirelessly while working through the live demo. Until it occurred to me: HDMI ports aren't accessible on the hotel's wall mounted flat screens--only the composite ports, on the side of the television. So. Is there a way to share my MBA's desktop on the wall-mounted television without sinking a ton of money into the process? Either wired or wireless...don't need audio, just video. Thanks in advance.