In addition to Hook's comments (which I agree with), I also think some critical information is missing on how you got to this point in the hand (who raised and reraised and on which streets), postion, stack sizes, opponent ability, your read, etc.
Without this info, best I can say by looking at the board is, I know I lose if my opponent holds Ax or Jx. Assuming my opponent is not completely retarded (this is just an assumption for this response because we've all seen the morons out there), then I have to fold this my 99 because the likelilhood of him holding A or J is good enough (or he has the nuts to be all in without the nuts. :biggrin: )
The addition of more information could change my response.