Mounting the tv on the wall how to wire for a wii?

Ok so we're going to put our tv over the fireplace. We're having an electritian run an hdmi and another cable through the wall for the cable box and playstation. But we don't know what to do about the wii. The cable isn't long enough to run through the wall. Is there some kind of extender for the cable that hooks the wii to the tv?