Need help in Ajax

<p id="post3">
</p>
<p>
<?php echo $ajax->link(
'Response will be add at the top of selected element',
array( 'controller' => 'ajax', 'action' => 'view', 3 ),
array( 'update' => 'post3', 'position' => 'prepend')
);
?>
</p>


Where to use this and it shows error like

Undefined variable: ajax [APP\View\Posts\index.ctp, line 39]

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