PHP/MySQL Messaging System?

[Far Cry]

How would I go about making one of theese???? I REALLY need one for my site I have a users table and a login and reg system here is the user table

 

 

DROP TABLE IF EXISTS users;

 

CREATE TABLE users (

username varchar(30) primary key,

password varchar(32),

userid varchar(32),

userlevel tinyint(1) unsigned not null,

email varchar(50),

timestamp int(11) unsigned not null

);

[ghostcoder]

Do you have a specific question? Asking about a 'messaging system' is quite vague.