count number of working days from a start date

Hi Expert's excel 2007

I need to formula to work out the number of working day's that have passed from say from 01/10/2013..yo dates date.
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MacroShadowConnect With a Mentor Commented:

B1 = First date
B2 = Last date
B3:B10 = Custom holidays (optional)

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myomotoConnect With a Mentor Commented:
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route217Author Commented:
Excellent thanks for the feedback. .
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