I need help with checkbox

The view...

$form->input('Curse.0.curse_id',array('type' => 'checkbox', 'value' => 13)); 

$form->input('Curse.1.curse_id',array('type' => 'checkbox', 'value' => 14)); 

$form->input('Curse.2.curse_id',array('type' => 'checkbox', 'value' => 15)); 

....

how do I recoup the fields checked for edition?

my controller:

function edit($id=null){

...

 $this->data = $this->User->read(null, $id);

...

}

Regards...