function encrypt(clear) {
    var crypted = '';
    for(var i = 0 ; i < clear.length ; ++i) {
        crypted += String.fromCharCode(clear.charCodeAt(i) + 1);
    }
    return crypted;
}

function uncrypt(crypted) {
    var clear = '';
    for(var i = 0 ; i < crypted.length ; ++i) {
        clear += String.fromCharCode(crypted.charCodeAt(i) - 1);
    }
    return clear;
}