help with ajax and javascript in php

[jeddsal]

so basically i have a form which has an input type text for id and then i also have a input type text for name..

and then i also have a query in which it gets the matching name for that id.

sample : sql = "select name from names where id = '".$id."'";

how can i implement this concept in which, you can input the id and then the name of that corresponding id which automatically display in the name textbox..

<label>Id</label>
<input type="text" name="id" id="id"/>

<label>Name</label>
<input readonly="text" name="name" id="name" value="" />

im new to javascript and ajax so i dont really know my way around it very much...i would really appreciate your help

[YarrOfDoom]

Have a PHP-script output the value so an XMLHttpRequest-object in Javascript can request it.
You can find the details on how to do this here: W3Schools AJAX Tutorial