<a href="?side=forum">FORUM</a>
<hr>
<?php
include("include.php");
?>

<?php
$side = $_GET['side'];

if(!empty($side) ){
include("inc/$side.php");
} else {
include("inc/nyheter.php"); // Om du vil ha nyheter som default på forsiden.
}

?>

<a href="?page=hovedside"><img src="buttons/index.jpg" style="border: 0px; height: 26px; width: 90px"></a>

<?php
// The default/main file (if file not exists, or $_GET['page'] is empty)
$mainFile = 'hovedside';

// The directory where your files to include i saved
$dir = 'inc';

// File extension
$fileExt = '.php';

// Checks if $_GET['page'] is empty or not
$page = !empty($_GET['page']) ? $_GET['page'] : $mainFile;

// make the full path to the file.
$fullDir = $dir.$page.$fileExt;

// Checks if file exists, and is readable
if (is_file($fullDir) && is_readable($fullDir)) {
	$include = $fullDir;
} else {
	// If not, we include the main file.
	$include = $mainFile;
}
include $include;
?>

if ( is_file ( 'sider/' . $_GET['side'] . '.php' ) ) {
include 'sider/' . $_GET['side'] . '.php';
} else {
include 'sider/forside.php';
}

<div style="width: 100px; height: 100px; overflow: auto;">
    include nnnholdet her:)
</div>

<?php

$folder = 'inc/';

$pagez = ($page = substr (strtolower (preg_replace ('([^a-zA-Z])', '', $_GET['page'])), 0, 20)) ? $page : 'hovedside';
$page = $folder.$pagez . '.php';

if (is_file($page) && is_readable($page)) {
	include($page);
} else {
	header ("HTTP/1.0 404 Not Found");
	echo '<strong> ERROR: 404 </strong> <em>?page='.$pagez.'</em><br /> 
		Denne siden kan ikke vises. Grunner til dette kan være: <br />';
	echo '- Siden er flyttet <br /> - Siden eksisterer ikke.';
}
?>