count how many days

can someone help me write a function that takes in 2 dates and counts how many days between the dates but only counting days between monday and friday?

http://brian.donoho.com/no_excuses/2006/02/vbscript-calculate-working-business.html

thanks - how would i do in sql? like to get the last 3 business days records

have a look here (http://classicasp.aspfaq.com/date-time-routines-manipulation/how-do-i-count-the-number-of-business-days-between-two-dates.html)