Days calculation excluding weekends

Hi

I made a pdf form in acrobat pro XI. In the file I need to calculate total days excluding weekends. I went through the community and come up with the below code. This code counts Saturday and Sunday as weekends.

// get the end date value

var Date1 = this.getField("From").value;

// get the start date value

var Date2 = this.getField("To").value;

var dDate2 = util.scand("dd/mm/yyyy H:MM:SS", Date2 + " 0:00:00");

var dDate1 =util.scand("dd/mm/yyyy H:MM:SS", Date1 + " 0:00:00");

1. event.value = calcBusinessDays(dDate1, dDate2);

function calcBusinessDays(dDate1, dDate2) { // input given as Date objects

    var iWeeks, iDateDiff, iAdjust = 0;

    if (dDate2 < dDate1) return -1; // error code if dates transposed

    var iWeekday1 = dDate1.getDay(); // day of week

    var iWeekday2 = dDate2.getDay();

    iWeekday1 = (iWeekday1 == 0) ? 7 : iWeekday1; // change Sunday from 0 to 7

    iWeekday2 = (iWeekday2 == 0) ? 7 : iWeekday2;

    if ((iWeekday1 > 5) && (iWeekday2 > 5)) iAdjust = 1; // adjustment if both days on weekend

    iWeekday1 = (iWeekday1 > 5) ? 5 : iWeekday1; // only count weekdays

    iWeekday2 = (iWeekday2 > 5) ? 5 : iWeekday2;

    // calculate differnece in weeks (1000mS * 60sec * 60min * 24hrs * 7 days = 604800000)

    iWeeks = Math.floor((dDate2.getTime() - dDate1.getTime()) / 604800000)

    if (iWeekday1 <= iWeekday2) {

iDateDiff = (iWeeks * 5) + (iWeekday2 - iWeekday1)

    } else {

iDateDiff = ((iWeeks + 1) * 5) - (iWeekday1 - iWeekday2)

    }

    iDateDiff -= iAdjust // take into account both days on weekend

    return (iDateDiff + 1); // add 1 because dates are inclusive

  }

My problem is that, I need to count Thursday and Friday as weekends. I have very little knowledge in javascript.

Any help would be greatly appreciated.

Regards