function check_tarif(value)
{
	if (value == 0)
	{
		document.offer.stavka_ryb.disabled = false;
		document.offer.stavka_kop.disabled = false;
		document.offer.tarif_ryb.disabled = true;
		document.offer.tarif_kop.disabled = true;
	}
	else if (value == 1)
	{
		document.offer.stavka_ryb.disabled = true;
		document.offer.stavka_kop.disabled = true;
		document.offer.tarif_ryb.disabled = false;
		document.offer.tarif_kop.disabled = false;
	}
	else if (value == 2)
	{
		document.offer.stavka_ryb.disabled = true;
		document.offer.stavka_kop.disabled = true;
		document.offer.tarif_ryb.disabled = true;
		document.offer.tarif_kop.disabled = true;
	}
}