<td width="70%" style="font:Arial, Helvetica, sans-serif">
<?php
if (isset($_GET['forum'])) {
$page = $_GET['forum'];
if ( !empty($page) && file_exists('./forum/' . $page . '.php') && stristr( $page, '.' ) == False )
{
   $file = './forum/' . $page . '.php';
}
else
{
   $file = './forum/index.php';
}

include $file;
} else {
$page = $_GET['page'];
if ( !empty($page) && file_exists('./' . $page . '.php') && stristr( $page, '.' ) == False )
{
   $file = './' . $page . '.php';
}
else
{
   $file = './default.php';
}

include $file;
}
?></td>