CakePHP w/ jQuery (Javascript/Ajax) simple link and update - what am I doing wrong?

I am simply trying to use jQuery to print out the contents of an action. But I cannot get my div to update with the echoed content. What am I doing wrong?

b开发者_开发问答irds_controller.php

...
    var $helpers = array('Js', 'Html', 'Ajax');
    var $components = array('RequestHandler');

function birds_ajax_1() {
    function birds_ajax_1_func_1() {
        $this->autoRender = false;
        echo "Text from Ajax clickaroo.";
    }
}
...

birds_ajax_1.ctp

<?php
    echo $ajax->link('Ajax Link', array('controller' => 'birds',
    'action' => 'birds_ajax_1_func_1'), 
         array('update' => 'ajax_div', 'complete' => 'alert("Ok.")'));
?>

<div id="ajax_div"></div> <!-- echoed text is not showing here? -->

default.ctp

...
echo $this->Html->script('jquery'); // Yes. My jQuery is being pulled in OK.
...

...
echo $this->Js->writeBuffer();
...

This is what is being dumped to my source:

...
        <a href="/php/cake_app_birds_v1.3/birds/birds_ajax_1_func_1"     id="link2019467549" onclick=" event.returnValue = false; return false;">link1</a><script     type="text/javascript">

//<![CDATA[
Event.observe('link2019467549', 'click', function(event) { new Ajax.Updater('ajax_div','/php/cake_app_birds_v1.3/birds/birds_ajax_1_func_1',     {asynchronous:true, evalScripts:true, onComplete:function(request, json) {alert("Ok.")},     requestHeaders:['X-Update', 'ajax_div']}) }, false);
//]]>

birds_controller.php

var $helpers = array('Js' => array('Jquery'), 'Html', 'Ajax');
var $components = array('RequestHandler');

function birds_ajax_1() {
    if ($this->RequestHandler->isAjax()) {
    $this->render('/elements/birds_ajax_1'); // this birds_ajax_1.ctp contains the output into the #ajax_div.
    }
}

birds_ajax_1.ctp

<?php
// Note I am not using the $ajax->link(...
echo $this->Js->link('Ajax Link', array('controller' => 'birds',
'action'     => 'birds_ajax_1'), array('update' => '#ajax_div'));

?>

<div id="ajax_div"></div>

Nothing changed in default.ctp.

Hope this is helpful to someone else who might be going through the confusion I just went through! Glad I found the light! Now onto some jQuery sorting ? Oh boy.