Random

function rand(min, max) {
    return Math.random() * (max - min + 1) - min;
}

function randInt(min, max) {
    return Math.floor(rand(min, max));
}

function randPassword(required) {
    if (required === undefined)  {
        required = 6;
    }
    var chars = '1234567890QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm';
    var password = '';
    for (var i = 0; i < required; ++i) {
        password += chars.charAt(Math.floor(Math.random() * chars.length));
    }
    return password;
}