function DatePickerUpdate(name, id, type, selector) {
    if (type == 'start') {
        var day_index = $('#' + name + '-start-day').attr("selectedIndex");
        var day_count = $('#' + name + '-start-day').children().size();
        var year_month_index = $('#' + name + '-start-year-month').attr("selectedIndex");

        day_index++;
        if ((day_index+1) > day_count) {
            day_index = day_count - 31;
            year_month_index++;
        }

        $('#' + name + '-end-day').attr("selectedIndex", day_index);
        $('#' + name + '-end-year-month').attr("selectedIndex", year_month_index);
    }
}