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I've been trying to follow similar posts and the solutions do not seem to work for me.  Any help would be appreciated.  I'm trying to disable weekends and specific dates.  I can't seem to get the beforeShowDay working.  In the example below I can get either the weekends or the specific dates disabled by calling either onDate: $.datepick.noWeekends or onDate:nationalDays (respectively)

I'm using jQuery 1.4.4
Datepicker extensions for jQuery v4.0.5


var natDays = [[4, 15],[4, 28] ];
$(function() {
    $('#popupDatepicker').datepick();
    $('#inlineDatepicker').datepick({
        rangeSelect: true,
        monthsToShow: 2,
        minDate: +1, maxDate: +30,
        //onDate: $.datepick.noWeekends,
        //onDate:nationalDays,
        beforeShowDay:noWeekendsOrHolidays
    });
});



function nationalDays(date, inMonth) {
    if (inMonth) {
        for (i = 0; i < natDays.length; i++) {
            if (date.getMonth() + 1 == natDays[i][0] &&
                    date.getDate() == natDays[i][1]) {
                return [0, "disabled"];
            }
        }
    }
    return {};
}

function noWeekendsOrHolidays(date) {
  var noWeekend = $.datepick.noWeekends(date);
  if (noWeekend[0]) {
                        return nationalDays(date);
                } else {
                        return noWeekend;
                }

}