Re-initialize LS datepicker madness

gistfile1.txt

jQuery(function($) {
  $('#FoxyGift_Configuration_foxygift_flexible_validity_date').change(function() {
    if ($(this).is(':checked')) {
      $('#form_field_foxygift_valid_daysFoxyGift_Configuration').addClass('hidden');
      $('#form_field_foxygift_valid_untilFoxyGift_Configuration').removeClass('hidden');
    }
    else {
      $('#form_field_foxygift_valid_daysFoxyGift_Configuration').removeClass('hidden');
      $('#form_field_foxygift_valid_untilFoxyGift_Configuration').addClass('hidden');
    }
    $('#FoxyGift_Configuration_foxygift_valid_until').get(0).phpr_control_initialized = undefined;
    $('#FoxyGift_Configuration_foxygift_valid_until').next('.datePickerWrapper').remove();
    $('#form_field_foxygift_valid_untilFoxyGift_Configuration').get(0).getTab().fireEvent('onTabClick');
  });

  $(window).load(function() {
    $('#FoxyGift_Configuration_foxygift_flexible_validity_date').change();
  });
});