Protoype is an excellent javascript framework that provides an easy way to make ajax calls.

Here is the sample code of how to make the call:

//first I am passing a variable that I call id, this would be the row id for the database table being used, for example: if I'm updating the record with the id of 4, I would call: javascript:dosomethingAjax('4');
//the id is passed to the file dosome.php that will handle whatever it is you are trying to do
//if you want to pass more variables through the ajax call you would use commas to separate them, for example: parameters: {u: id, name: 'John', age: 24}

function dosomethingAjax(id) {
var myAjax = new Ajax.Request('dosome.php',
{method: 'get', parameters: {u: id},
onComplete: handleResponse});
}
//once dosome.php gets processed, the ajax call is complete and the following function is called, in this case, I am putting the results inside a div with the id of displayResults
function handleResponse(transport) {
document.getElementById('displayResults').innerHTML = transport.responseText;
}

//here is how to setup the dosome.php

<?php
//the variable u is being passed by the ajax call listed above
$id = $_GET['u'];
//do something like update or insert or select
echo "Success!";
?>

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