phpbb3 login from another page

Main page's starting codes:
 
<?php 
function selfURL() { $s = empty($_SERVER["HTTPS"]) ? '' : ($_SERVER["HTTPS"] == "on") ? "s" : ""; $protocol = strleft(strtolower($_SERVER["SERVER_PROTOCOL"]), "/").$s; $port = ($_SERVER["SERVER_PORT"] == "80") ? "" : (":".$_SERVER["SERVER_PORT"]); return $protocol."://".$_SERVER['SERVER_NAME'].$port.$_SERVER['REQUEST_URI']; } function strleft($s1, $s2) { return substr($s1, 0, strpos($s1, $s2)); }
?>
<?php
define('IN_PHPBB', true);
$phpbb_root_path = './forum/';    //Path to forum
$phpEx = substr(strrchr(__FILE__, '.'), 1);
include($phpbb_root_path . 'common.' . $phpEx);
 
// Start session management
$user->session_begin();
$auth->acl($user->data);
$user->setup('ucp');
 
?>
 
 
<?php if ($user->data['user_id'] != ANONYMOUS)
{       
?>
 
 
 
<table background="images/topmenubg.png" height="26" width="100%" border="0" cellspacing="0" cellpadding="0">
    <td><table width="100%" border="0" cellspacing="0" cellpadding="0">
      <tr>
        <td width="2%"><img src="images/anahtar.png" width="27" height="24"></td>
        <td class="topmenutype" width="50%">
Welcome <?php echo $user->data['username'];?>! <a href="index.php?LogOut=1"> Log Out</a>
       
        </td>
        <td class="topmenutype" width="50%"></td>
      </tr> 
    </table></td>
  </tr>
</table>
 
 
<?php if ($user->data['user_type'] > 2){       
?>
<?php } ?>
 
      <?php } else {?>
 
<table background="images/topmenubg.png" height="26" width="100%" border="0" cellspacing="0" cellpadding="0">
 <form id="login" method="post" action="forum/ucp.php?mode=login" onsubmit="return process_form(this)" name="phpbblogin"> 
   <tr>
      <td><table width="400" border="0" cellspacing="0" cellpadding="0">
        <tr>
          <td width="30"><img src="images/anahtar.png" alt="" width="27" height="24" /></td>
          <td width="191"><span class="topmenutype">
          <label>
            <input name="username" type="text"  id="Username" size="10" />
          </label>
          <input name="password" type="password"  id="Password" size="10" />
          <input name="redirect" value="<?php print(selfURL());?> " type="hidden" />
          <input type="hidden" name="login" value="login" />
          <input name="sub" value="Log in" type="hidden" />
          </span></td>
          <td width="179"><span class="topmenutype">
            <input name="button"   src="images/login.png" type="image" class="header" id="button" value="Login" />
          </span></td>
        </tr>
      </table></td>
      </tr> 
   </form>
    </table>
 <?php } ?>

                                  

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