Question about networkdays

[#1]

Dear all,

I have a question about networkdays and holidays.

I have a table with country code and dates of festivity.

I want to do a networkdays function between one start date and end date, but using as holidays date of destiny country, but i have no idea how to do that.

Example table

Sender;CountryS;Receiver;CountryR;StartDate;Enddate

1;ES;2;PT;02/01/2010;15/02/2010

1;ES;2;IT;02/01/2010;17/02/2010

Then I have another table with

FEST:

CountryR;Days

PT;04/01/2010

PT;07/01/2010

IT;05/01/2010

I want to do a networkdayes(StartDate,Endate;FEST DAYS THAT COUNTRY is COUNTRYR)

How can I do that function.

Best regards;