jQuery Datepicker disabled dates
<script type="text/javascript">

    var bookedDaysList = [[6, 26], [6, 27]];

                function bookedDays(date, inMonth) {
                    if (inMonth) {
                        for (i = 0; i < bookedDaysList.length; i++) {
                            if (date.getMonth() + 1 == bookedDaysList[i][0] &&
                                    date.getDate() == bookedDaysList[i][1]) {
                                return {dateClass: 'datepick-selected',selectable: true};
                            }
                        }
                    }
                    return {};
                }

                /* create datepicker */

                jQuery(document).ready(function () {

                    jQuery('#show-dates').datepick({
                        dateFormat: 'dd-mm-yy',
                        altFormat: '[m,d]',
                        onDate: bookedDays,
                        buttonImage: 'css/images/datepicker.gif',
                        buttonImageOnly: true,
                        monthsToShow: 3,
                        multiSelect: 999,
                        showOn: 'both'
                    });
                });


</script>