<?php
/* ./app/code/local/Acme/Dynamic/controllers/JsController.php */
class Acme_Dynamic_JsController extends Mage_Core_Controller_Front_Action {
    public function indexAction() {
        // Set the appropriate content-type
        $this->getResponse()->setHeader('Content-type', 'text/javascript');
        // Loads and renders the layout file we will create soon
        $this->loadLayout();
        $this->renderLayout();
    }
}