Hai I am sathiya
i display my database records using PHP .
i display radio buttons to select the candidate. and at last i will give submit button to update .

But i want to update each and every candidate by clicking the radio button seperately by using AJAX.

please give me solution for that.......

with regards,
sathiya

AJAX is using JavaScript on the browser to get an update from the sever without reloading the page.
To use this, you will need to understand JavaScript pretty well, the DOM, and be able to write some PHP to respond to your AJAX call.

You can use an AJAX library to simplify the JavaScript side.
http://code.google.com/p/xhr/
http://code.google.com/p/xmlhttprequest/

Or you can use a full JavaScript library such as JQuery, MooTools, Dojo, etc.