Negative Working Hours

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Hi Folks,

I'm hoping yous can help me, a few weeks ago I put up a couple of posts on
calculating working hours with the use of the networkdays function. This
works great, however I seem to be getting negative values causes by
calculating time over the weekend(outwith working hours). Please example
below.

A B
1 01/07/2005 11:50 01/07/2005 13:49
2 06/07/2005 16:03 06/07/2005 17:00
3 08/07/2005 13:43 11/07/2005 09:36

Using the following expression I get these values.

=(NETWORKDAYS(B2,A2)-1)*8.5+(MOD(B2,1)-MOD(A2,1))*24 = 1.99
=(NETWORKDAYS(B3,A3)-1)*8.5+(MOD(B3,1)-MOD(A3,1))*24 = 0.95
=(NETWORKDAYS(B4,A4)-1)*8.5+(MOD(B4,1)-MOD(A4,1))*24 = -29.61

Any ideas on how I can accurately give the number of hours for cells A3 and
B3?

Thanks in advance,

Mo..
.