jQuery datepicker years shown

$("#restricting").datepicker({
    yearRange: "-20:+0", // this is the option you're looking for
    showOn: "both",
    buttonImage: "templates/images/calendar.gif",
    buttonImageOnly: true
});

"$(".selector").datepicker({ beforeShowDay: nationalDays})
natDays = [[1, 26, 'au'], [2, 6, 'nz'], [3, 17, 'ie'], [4, 27, 'za'],
[5, 25, 'ar'], [6, 6, 'se'], [7, 4, 'us'], [8, 17, 'id'], [9, 7,
'br'], [10, 1, 'cn'], [11, 22, 'lb'], [12, 12, 'ke']];
function nationalDays(date) {
    for (i = 0; i < natDays.length; i++) {
      if (date.getMonth() == natDays[i][0] - 1 && date.getDate() ==
natDays[i][1]) {
        return [false, natDays[i][2] + '_day'];
      }
    }
  return [true, ''];
}

$( ".datefield" ).datepicker({
     changeMonth: true,
     changeYear: true,
     yearRange:-90:+0
});

.au_day {
  text-indent: -9999px;
  background: #eee url(au.gif) no-repeat center;
}