function chooseProvince () {
	if (document.getElementById("province_id").value > 0) {
		$.getJSON(
			"ajax/findCities.php",
			{ id: document.getElementById("province_id").value },
			function(data) {
				$("#region_id").empty();
				$("#region_id")[0].disabled = true;
				$.each(data.cities, function(i, city) {
					var opt = $("<option>");
					opt.attr('value', city.id);
					opt.html(city.name);
					$("#region_id").append(opt);
				});
				$("#region_id")[0].disabled = false;
			}
		);
	} else {
		$("#region_id").html('<option value="0">Choose a City</option>');
		$("#region_id")[0].disabled = true;
	}
}