help please with calculating option values

  1. 404 Posts.
    Does anyone have a program(or other method) for calculating the 'fair value' of an ASX traded stock option?
    I am looking at SBP and their options SBPOA.
    The options are exercisable @ 12c by 19/09/04
    @ 20c by 19/09/05
    @ 30c by 19/09/06
    SBP FPO currently trading at 14c = 2c intrinsic value.
    But what abnout the time value?
    They seem cheap to me @4c but that's what the market is paying.
    Any help gratefully received.
    cheers, PS
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