想用portal.php文件调用外部的地址显示出来

想用portal.php文件调用外部的地址显示出来
如引用地址为baidu点com
保留原来的顶部和底部中间加载出百度的网页该如何实现
望大神赐教一下，谢谢
代码如下
<?php

/**
*      [Discuz!] (C)2001-2099 Comsenz Inc.
*      This is NOT a freeware, use is subject to license terms
*
*      $Id: portal.php 33234 2013-05-08 04:13:19Z andyzheng $
*/

define('APPTYPEID', 4);
define('CURSCRIPT', 'portal');

require './source/class/class_core.php';
$discuz = C::app();

$cachelist = array('userapp', 'portalcategory', 'diytemplatenameportal');
$discuz->cachelist = $cachelist;
$discuz->init();

require DISCUZ_ROOT.'./source/function/function_home.php';

require DISCUZ_ROOT.'./source/function/function_portal.php';

if(empty($_GET['mod']) || !in_array($_GET['mod'], array('list', 'view', 'comment', 'portalcp', 'topic', 'attachment', 'rss', 'block'))) $_GET['mod'] = 'index';


define('CURMODULE', $_GET['mod']);
runhooks();

$navtitle = str_replace('{bbname}', $_G['setting']['bbname'], $_G['setting']['seotitle']['portal']);
$_G['disabledwidthauto'] = 1;

require_once libfile('portal/'.$_GET['mod'], 'module');

?>

可以在相应的地方用iframe 嵌入

加到 门户模板里面哦 template\default\portal\index.htm