Can you provide a little background information?
Have you recently messed with the airbag at all or did this just suddenly pop into being? Change the battery recently? Anything that you may have done recently that is correlated with the appearance of the light would be helpful.
There is a procedure to clear the light, but I think I would be more comfortable knowing why it is on first. That is just me, and someone else may very well post the procedure up for you...