Air Bag Light Blinking, 41

Hi there,

I'd really appreciate any help anyone could give me. I recently commuted with my Mystique (95) for an hour a day. Then I moved into the city and no longer had to. I left it sitting for two weeks, and when I started it up again, the airbag light was blinking. It does 1 blink, then 4, then repeats. I've looked up the codes and it tells me what it is, but not in terms I can understand. Is it dangerous to drive it with this code flashing?

I want to sell this car, so all I really want to know is if it's safe to drive, and maybe how much this could potentially cost me to fix.

Thanks!