Cables Modems/Networling

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Ok, here's the deal, let's see if anyone can help...Right now, I have two computers in one room with a cable modem and a router, I want to move my computer into my room, but I only have one cable jack going from the wall to my tv. Is there a splitter I can get, or do I have to put another cable jack in the wall? I want to have my TV, Computer with cable modem, and XBox Live when it comes out all in my room. With the XBox, it uses broadband, since I already have the router, that is no prob. Goddamnit, I HATE WIRING SHIT!

EDIT* : Now I look like a dipshit because I misspelled my topic title!