Thickbox not working. Please help

Hello, Trying to implement thickbox but when I click the image/link it
does nothing.

in template head I have this:
<?php echo $this->Html->script(array('jquery/
jquery-1.4.4.min','jquery/jquery-ui-1.8.6.custom.min', 'thickbox/
thickbox.js'));?>

and this:
<?php echo $scripts_for_layout; ?>
<?php $css_for_layout; ?>

both thickbox and jquery show in firebug

thickbox.css in webroot

in AppController:
var $helpers = array('Time','Html', 'Form', 'Session', 'Javascript',
'Js' => 'Jquery', 'Calendar.Calendar', 'Calendar');

in my view:
echo $this->Html->link(
$this->Html->image('/useruploads/document.png',
array('width'=>'50px')),
'/useruploads/document_large.png',
array(
'escape' => false,
'class' => 'thickbox'
)
);

What I actually need is this but using the above as a test:
echo $this->Html->link(
$this->Html->image('/useruploads/document.png',
array('width'=>'50px')),
array(
'controller' => 'templates',
'action' => 'view',
$template['Template']['id']
),
array(
'escape' => false,
'class' => 'thickbox'
)
);

If I remove the 'class' => 'thickbox' the link works fine but no
thickbox. What am I missing

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