$(document).ready(function(){
  $("#date_picker_holder").datepicker({
     dateFormat: 'dd-mm-yy',
     dayNamesMin: ['Zo','Ma','Di','Wo','Do','Vr','Za'],
     monthNames: ["Januari", "Februari", "Maart", "April", "Mei", "Juni", "Juli", "Augustus", "September", "Oktober", "November", "December"],
     buttonImageOnly: true,
     buttonImage: "/images/search-when.png",
     buttonText: 'Kies datum',
     showOn: 'button',
     onSelect: function(dateText, inst) {
       $("#search-date").submit();
     }
   });
});