AJAX
•	What is ajax
•	Connecting to server using JavaScript
•	Downloading data behind scenes
•	Modifying web pages on the fly
•	Creating an XMLHttpRequest Object in different browsers
•	Checking the XMLHttpRequest Object's readyState property
•	Checking the XMLHttpRequest Object's status property
•	Getting Your Data With the XMLHttpRequest Object
•	Problems creating an XMLHttpRequest Object
•	Fetching Text Data From the server
•	Using the text data received through XMLHttpRequest