function get_cities(province_code) {
	if (province_code) {
		document.getElementById("province_code").value = province_code;
		document.getElementById("action_frame").src = 'includes/get_cities.php?p=' + province_code;
	} else {
		document.getElementById("province_code").value = "";
		document.getElementById("cities").disabled = true;
		document.getElementById("cities").options.length = 0;
		document.getElementById("addresses").innerHTML = "";
		document.getElementById("direction_url").href = "http://maps.google.com";
		document.getElementById("direction").style.display = "none";
		document.getElementById("google_map").style.display = "none";
	}
}

function get_addresses(city_name) {
	if (city_name) {
		document.getElementById("action_frame").src = 'includes/get_addresses.php?p=' + document.getElementById("province_code").value + '&c=' + city_name;
	} else {
		document.getElementById("addresses").innerHTML = "";
		document.getElementById("direction_url").href = "http://maps.google.com";
		document.getElementById("direction").style.display = "none";
		document.getElementById("google_map").style.display = "none";
	}
}