Javascript Generate Password

gistfile1.js

    generatePassword = function(l) {
        l = l ? l : 8;
        var charset = "abcdefghijklnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789",
            retVal = "";
        for (var i = 0, n = charset.length; i < l; ++i) {
            retVal += charset.charAt(Math.floor(Math.random() * n));
        }
        return retVal;
    }