cannot add onclick event on form input with multiple checkbox

Hello,

How can I add a javascript onclick event on a form input with multiple
checkbox?

I'm trying to do this using the following code..
<?php
echo $form->input('Role',
array('type'=>'select',
'multiple'=>'checkbox',
'options'=>$roles,
'label'=>'Roles:',
'onClick'=>'showTierDiv(this)'));
?>

However, when I view the source of the generated page using a browser,
I can see
that the onclick event "showTierDiv" was not included.

I also tried adding an onclick event using a form input with a
"single" checkbox and it works.

Here is the code:
<?php echo $form->input('tier',array
('label'=>'Tier','type'=>'checkbox', 'onclick'=>"showDiv(this)")); ?>

Is there any way to add onclick event on a form input with multiple
checkbox?
If none, are there any workarounds for this?

Thanks,

Mario

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