This would require hand coding, I Found an example of this through google here:
http://www.danielmayor.com/jquery-get-day-of-week-from-jquery-ui-datepicker-when-we-select-a-date
but we do not offer support for this through the forum. if you nee help implementing this, I suggest a premiere support appointment:
http://www.webassist.com/premier_request.php