Private Messaging System similar to Facebook using Ajax, Jquery and PHP

This tutorial helps and teaches you how to build a simple but powerful Private Messaging System which is similar to that of Facebook with amazing features such as the following:

(1) Sign up and Login without page refresh. 
(2) Displaying of users in the system which could also be referred to as Friends List.
(3) Sending of messages without page refresh.
(4) Displaying of newly sent message(s) without page refresh.
(5) File attachments.
(7) Hide and show send message button.
(8) Press enter key to send messages.
(9) View all conversations had with users.
(10) Nice view of date and time messages are or were sent.
(11) Delete messages without page refresh.
(12) Nice confirmation box for message deletion and log out, etc.

The system supports all browsers and the script is written in a way that any one can easily understand and customize with proper programming code comments to ease usability.

Click here to view this tutorial