Formula to Count weekdays only - excluding Holidays, too

I need some help tweaking a formula (version 2007) that counts working days each month. I have it working so far except I can get it to omit holidays. I have a list of holidays on separate tab that can be referenced.

Anyway, easiest thing is to attach the spreadsheet. I need help with the column G formula. It doesn't double count the Holidays, but I would strongly prefer the have the cell blank (or even out an "H" in the cell) if that days is one of the Holidays.

Thanks in advance for any help.