Sorry its 21 days !
http://www.amazon.co.uk/exec/obidos/ASIN/0672324032/ref=pd_sim_b_dp/026-5874633-9754033
or this one ::
teach yourself in 24 hours ::
http://www.amazon.co.uk/exec/obidos/ASIN/0672317907/ref=pd_ecc_rvi_f/026-5874633-9754033
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