Passsword generator bookmarklet (javascript)

passgen.js

javascript:(function() {
    var lowers = 'abcdefghijklmnopqrstuvwxyz';
    var uppers = lowers.toUpperCase();
    var nums = '123456789';
    var alphabeet = lowers + uppers + nums;
    var pass = '';
    for (var i = 0; i<8; i++) {
        var x = Math.floor(Math.random() * alphabeet.length);
        pass += alphabeet[x];
    }
    prompt('Password: ', pass);
})();