function updateCity() {
    val = $('#search_city').val();
    if (val != '') $('#frm_select_city').submit();
}

function updateRegion() {
    val = $('#search_region').val();
    if (val == lastRegion) return false;

    lastRegion = val;
    $('#search_city').removeOption(/./);
    if (val != '') $('#search_city').addOption(cities[lastCountry][lastRegion], false);

    return false;
}


function updateCountry() {
    val = $('#search_country').val();
    if (val == lastCountry) return false;

    lastCountry = val;

    $('#search_region').removeOption(/./);
    $('#search_city').removeOption(/./);
    if (val != '') $('#search_region').addOption(regions[lastCountry], false);

    return false;
}