Get a value of a select using JS helper.

I'm trying to build a simple dynamic state / city dropdown menu that
pulls from my database... Everything is working except I cannot get
the value of the "#divstate" to further populate the city... If I
manually enter a # into 'param1', it gets the correct information, and
correctly updates the "#divcity"

Let me know if you need more code, thanks!

<?php

echo $this->Form->create('newForm');
echo $this->Form->input('teacher', array ('type'=>'select', 'id' =>
'divstate', 'options' => $states ));
echo $this->Form->input('classes', array ('type'=>'select', 'id' =>
'divcity', 'empty' => '-- Pick a state first --'));
echo $this->Form->end();
?>

<?php

$this->Js->get('#divstate')->event('change',
$this->Js->request(array(
'action' => 'getcities', 'param1'), array(
'async' => true,
'update' => '#divcity',
'data' => '$("divstate").serialize()',
'dataExpression' => true
)));

?>

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