Erin,

Something like this:

***count number of weeks and add or subtract for days that fall in the
***middle of the week

lworkdays=(year(lenddate)*52+week(lenddate,2,3)-;
year(lstartdate)*52+week(lstartdate,2,3))*5-;
(5-dow(lenddate,2))-; &&if lastday isn't friday
(dow(lstartdate,2)+1) &&if first day isn't monday

My math might be a little off, but this should give you the general idea.