function calendar_setup()
{
if (document.getElementById('f_date_b')) {
    Calendar.setup({
            inputField     :    "f_date_b",           //*
            ifFormat       :    "%Y-%m-%d",
            showsTime      :    false,
            button         :    "f_trigger_b",        //*
            step           :    1
        });
        }
}