function changeFamilyPack()
    {
    if (document.getElementById('UQNPXMBZ_qty'))
        {
        if (document.getElementById('UQNPXMBZ_qty').value > 0)
            document.forms['main_form_spectators'].CCCM2CBO_qty.disabled = false;
        else
            {
            var the_additional = document.getElementById('CCCM2CBO_qty');
            the_additional.options[0].selected = 1;

            document.forms['main_form_spectators'].CCCM2CBO_qty.disabled = true;
            }        
        }
    }