[рони]

danon_13,

$(document).ready(function() {
    var datepicker;
    $("#form").change(function() {
        if (this.value == "data_otch" && datepicker) $(".for").html("").append(datepicker);
        else if ($("#datepicker-default").length) {
            datepicker = $("#datepicker-default").detach();
            $(".for").html('<input name="filtr" value="" class="form-control input-sm" id="" type="text">')
        }
    }).val("data_otch")
});