cakephp + router

<div style="float:right;">
    <?php echo $this->Form->create('Category',array('action'=>'index','type' => 'get')); ?>
     
    <?php echo $this->Form->input('id',array('label'=>'<u>Afficher la catégorie</u>','options'=>$optionsSelect,'onchange'=>'this.form.submit();')); ?>
    <noscript>
    <?php echo $this->Form->end('Afficher'); ?>
    </noscript>
</div>

Router::connect('/categories/index/:id',array('controller'=>'categories','action' => 'index','?'=>array('id'=>':id')));