Hi Leight - as the others have said, you really need to check the SG on this & make a comparison to when it was first put down. If you used the kit yeast that came with a one year old kit, there's no telling how old it is (you don't know how long the kit was sitting on the shelf before you bought it..) so the yeast might be buggered. Lack of bubbles through the air lock doesn't mean it's not fermenting, but could mean that the fermenter is not sealed properly, Co2 escaping from somewhere else (as nvs stated.) If you don't have a hydrometer, I strongly suggest you buy one, you really can't tell what's going on without one.
If no krausen, and SG hasn't changed, if it was me, yeah, I'd throw another *fresh* yeast in there.
Best of luck.