js helper not working for Internet explore

I am using cake 1.3
I have a simple select box when someone selects a state
the next select box populates the cites for that state

This works fine in firefox as well as chrome, but it does not update
my city select box for ie 7 or ie 8.

I think its not triggering the event in ie

<?php echo $this->Form-
>select('state_id',array($states),null,array('id'=>'states'),false);
?><br /><br /><?echo $this->Form-
>select('city_id',array(),null,array('id'=>'cites'),false);

$this->Js->get('#states')->event('change', $this->Js->request(
array('controller' => 'bonds', 'action' => 'update_city_select'),
array(
'update' => '#cites',
'async' => true,
'dataExpression' => true,
'method' => 'post',
'data' => $js->serializeForm(array('isForm' => false, 'inline' =>
true))
) ) );

?>

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