function expand_cities() {
    d = document.getElementById("citylist");
    if(d.style.display != 'block') 
        d.style.display = 'block'
    else
        d.style.display = 'none'
    return false;
}
function collapse_cities() {
    d = document.getElementById("citylist");
    d.style.display = 'none'
    return false;
}

function expand_country(id) {
    d = document.getElementById(id);
    if(d.style.display != 'block') 
        d.style.display = 'block'
    else
        d.style.display = 'none'
    return false;
}