Yesterday date, but want manual exception

I have a form in which it shows yesterday's date when you open it, unless it is a Monday then it shows Friday's date. The date is separated in 3, so I have ScanDate_month, Scandate_year, and ScanDate_day.

When the form opens, a hidden field (Today) sets today's date and another sets the day of the week (WeekDay).

var m = this.getField("ScanDate_month");
var y = this.getField("ScanDate_year");
var fld = this.getField("ScanDate_day");
var d1 = new Date();
var num = d1.valueOf();

if(this.getField("WeekDay").value == "Mon")
{
num += -(1000 * 60 * 60 * 24 * 3);
}
else
{
num += -(1000 * 60 * 60 * 24);
}

m.value = util.printd ("mm", new Date(num));
fld.value = util.printd ("dd", new Date(num));
y.value = util.printd ("yyyy", new Date(num));

I would like to add some exceptions for Holidays.

For example, if today's date is 03/29/2016, instead of showing 03/28/2016 it would show 03/24/2016 because Friday and Monday were Holidays.

I realize that I will need to add each Holiday manually in the script, but that would be fine.

So I used else if, but it doesn't accept my script saying there is an error after the first exception

if(this.getField("WeekDay").value == "Mon")
{num += -(1000 * 60 * 60 * 24 * 3);}

else if
((this.getField("WeekDay").value == "Tue") || (this.getField("WeekDay").value == "Wed") || (this.getField("WeekDay").value == "Thu") || (this.getField("WeekDay").value == "Fri"))
{num += -(1000 * 60 * 60 * 24);}

else if
(this.getField("Today").value == "03/29/2016");
{num += -(1000 * 60 * 60 * 24 * 5);}

else if
(this.getField("Today").value == "05/24/2016");
{num += -(1000 * 60 * 60 * 24 * 4);}

else if
(this.getField("Today").value == "07/04/2016");
{num += -(1000 * 60 * 60 * 24 * 4);}

Can someone help me figure out what is the error after the first exception?