Calendar.setup({
          inputField     :    "f_new_rem_start_date",
          ifFormat       :    "%Y-%m-%d",
          button         :    "trigger_new_rem_start_date",
          singleClick    :    false
      });

  Calendar.setup({
          inputField     :    "f_new_rem_end_date",
          ifFormat       :    "%Y-%m-%d",
          button         :    "trigger_new_rem_end_date",
          singleClick    :    false
      });