PHP: determine template

IndexController.php

////////////////////// public_html/controllers/IndexController //////////////////////
<?php
class IndexController extends Zend_Controller_Action
{
	public function loadTemplate($name)
	{
		if (!array_key_exists("isAjax", $_POST))
		{
			$this->view->action = $name;
			$this->_forward('container');
		}
	}
	public function indexAction()
	{
		$this->loadTemplate("index");
	}
	public function containerAction()
	{
		//containerAction automatically loads "smarty/templates/index/container.tpl"
	}
}

////////////////////// public_html/smarty/templates/index/container.tpl //////////////////////

<!-- ...html elements -->
	<div id="container">
{if isset($action)}
	{include file="index/$action.tpl"}
{/if}
	</div>
<!-- html elements... -->

////////////////////// public_html/smarty/templates/index/index.tpl //////////////////////

{include file="index/$action.$lang.tpl"}