달력에서 지난날짜도 선택가능하게 하려면 어떤부분을 수정해야할까요?

<script type="text/javascript"></script>/* Written by DaeKwon Kang ([email protected]). */jQuery(function($){ $.datepicker.regional['ko'] = {  closeText: '닫기',  prevText: '이전달',  nextText: '다음달',  currentText: '오늘',  monthNames: ['1월(JAN)','2월(FEB)','3월(MAR)','4월(APR)','5월(MAY)','6월(JUN)',  '7월(JUL)','8월(AUG)','9월(SEP)','10월(OCT)','11월(NOV)','12월(DEC)'],  monthNamesShort: ['1월','2월','3월','4월','5월','6월',  '7월','8월','9월','10월','11월','12월'],  dayNames: ['일','월','화','수','목','금','토'],  dayNamesShort: ['일','월','화','수','목','금','토'],  dayNamesMin: ['일','월','화','수','목','금','토'],  weekHeader: 'Wk',  dateFormat: 'yy-mm-dd',  firstDay: 0,  isRTL: false,  showMonthAfterYear: true,  yearSuffix: ''}; $.datepicker.setDefaults($.datepicker.regional['ko']); $('#wr_9').datepicker({  showOn: 'both',  //buttonImage: '//jqueryui.com/resources/demos/datepicker/images/calendar.gif',  //buttonImageOnly: true,  buttonText: "달력",  changeMonth: true,  changeYear: true,  showButtonPanel: true,  yearRange: 'c-99:c+99',  minDate: '+0d' });});</script>​