1) Ajax made Simple

Ajax in Simple steps.............ENJOYYYYYYYYY

Basically there are 3 things to be understood in Ajax

1) we have a request state that tells the request state after its being sent from AJAX/javascript code

State Description
0 The request is not initialized
1 The request has been set up
2 The request has been sent
3 The request is in process
4 The request is complete

2) A function is being called at every state of request .

xmlHttp.onreadystatechange=function()
{
if(xmlHttp.readyState==4)
{
// Get the data from the server's response
}
}

4) Get the data from the server's response

xmlHttp.responseText

Now Before all these we need 2 things more

1) get XMLHttpRequest object (its an ActiveXObject ).

2) send the request using
xmlHttp.open("GET","time.asp",true);
xmlHttp.send(null);