Push back start date

[lovethepirk]

I have a worksheet that I could use some vba help. Thanks in advance.

On the example.xls I need to do one of two things(I can manually edit the vba on the fly).

ie.
1) If "prefix"="xxx" push back "start date" 5 working days
or
2) If "Start date" >= 8/1/2011 push back "start date" 10 working days

Pretty simple but here's the catch, they can only be weekdays and not holiday. My other attachment lists just the working days and then the holidays are off to the right(they haven't been removed yet from the list of weekdays).

Thank you.