JQuery help with datepicker - minDate

How can I modify this script to "block" current date in my calendar datepicker popup?  I don't want users to pick the current date for my appointment application, ie., no same-day appointments allowed.  I'm modifying existing code and do not know javascript well.

$(document).ready(function() {
    $(#div_date").hide();
});

$(function () {
    $(#apptDate").datepicker({ beforeShowDay: $.datepicker.noWeekends}
  );
     $("#date_pickup_icon").click(function () {
        $("#apptDate").datepicker("show");
     });
});

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I use the jquery library.  There is an attribute (excuse the incorrect terminology); "minDate".  Default is NULL.  How do I use this to specify the blocking of the current date and previous dates.