I found the answer is to pass the parameter in the form create
function:

        if ($this->params['pass'] == null)
                $gallery_id = 0;
        else
                $gallery_id = $this->params['pass'][0];
        echo $this->Form->create('Image',
                array(
                        'enctype' => 'multipart/form-data',
                        'url' => 'add/'.$gallery_id
                )
        );

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