function enlarge(photo, option) {
    var ph = document.getElementById(photo);
    ph.style.display = option;
}
function refreshSecurityCode() {
    var code = document.getElementById('security-code');
    if (code == null) {return;}
    var now = new Date();
    code.src = code.src.split('?')[0] + '?x=' + now.toUTCString();
}