小弟我这个smarty配置如何了

我这个smarty配置怎么了
目录结构如下: smarty_pro1
  ---libs
  ---config
  ---templates (这里放了个，index.tpl)
  ---templates_c
  ---cache
  index.php

index.php 里的内容为
define('SMARTY_PATH','../smarty_pro1/');
include_once(SMARTY_PATH.'libs/Smarty.class.php');

$smarty=new Smarty();

$smarty->template_dir= SMARTY_PATH.'templates/';
$smarty->compile_dir= SMARTY_PATH.'templates_c/';
$smarty->config_dir= SMARTY_PATH.'configs/';
$smarty->cache_dir= SMARTY_PATH.'cache/';

$smarty->left_delimiter='{';
$smarty->right_delimiter='}';
$smarty->assign('title','测试一下');
$smarty->assign('content','内容');
$smarty->display('index.tpl');


?>

index.tpl内容为

{ $content }



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