This project is made with NodeJs. That's why it needs the environment to run this project.
1) Donwload NodeJs installer from http://nodejs.org and Install it.
2) Extract the source file and run the command prompt
   (For LinuxOS, terminal app.)
3) Run the following command in the source directory
   -> node app

The server port is 9000.

Open the browser and type the url: http://localhost:9000

About the chat app.
1) Type the username and roomname.   
2) Click Enter button.
   (The user can enter the chat by clicking enter key in the roomname field.)

Used Javascripts:
    jQuery, jQueryEasyUI.