Random

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

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

function randElem(arr)
{
    return arr[randInt(0, arr.length - 1)];
}

function randStr(len, chars)
{
    if (len == undefined)  {
        len = 8;
    }
    if (chars == undefined) {
        chars = '1234567890QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm';
    }
    var out = '';
    for (var i = 0; i < len; ++i) {
        out += randElem(chars);
    }
    return out;
}