jQuery UI datepicker non-working day hack : http://www.4mghc.com/threads/205643-Can-the-jQuery-UI-Datepicker-be-made-to-disable-Saturdays-and-Sundays-and-holidays

jquery-ui-datepicker-nonWorkingDates.js

$("input").datepicker({
    beforeShowDay: nonWorkingDates,
    numberOfMonths: 1,
    minDate: '05/01/14',
    firstDay: 1
});

function nonWorkingDates(date){
    var day = date.getDay(), Sunday = 0, Monday = 1, Tuesday = 2, Wednesday = 3, Thursday = 4, Friday = 5, Saturday = 6;
    var closedDates = [[7,25, 2014], [8, 14, 2014]];
    var closedDays = [[Monday], [Tuesday]];
    for (var i = 0; i < closedDays.length; i++) {
        if (day == closedDays[i][0]) {
            return [false];
        }

    }

    for (i = 0; i < closedDates.length; i++) {
        if (date.getMonth() == closedDates[i][0] - 1 &&
        date.getDate() == closedDates[i][1] &&
        date.getFullYear() == closedDates[i][2]) {
            return [false];
        }
    }

    return [true];
}