// Выбор метро (выпадающий список)
function metro_town_field(id_town)
{
	var msk = document.getElementById("m_msk");
	var spb = document.getElementById("m_spb");
        var kiev = document.getElementById("m_kiev");
        var obl = document.getElementById("m_msk_obl");

	if (id_town == 4)
	{
		// Метро Москвы

		spb.style.display = "none";
		msk.style.display = "block";
                obl.style.display = "none";
	}
        else if (id_town == 600) {

		spb.style.display = "none";
		msk.style.display = "none";
                obl.style.display = "block";
        }
	else if (id_town == 14)
	{
		// Метро Санкт-Петербурга

		msk.style.display = "none";
		spb.style.display = "block";
                obl.style.display = "none";
	}
        else if(id_town == 420) {
            kiev.style.display = "block";
        }
	else
	{
		if(msk) {
                    msk.style.display = "none";
                }

		if(spb) {
                    spb.style.display = "none";
                }

		if(obl) {
                    obl.style.display = "none";
                }

		if(kiev) {
                    kiev.style.display = "none";
                }
	}
}