menu.php
<div id="menu">
<ul>
<?php
foreach( $pages as $a_page ) {
echo "<li ";
if( $a_page == $page ) { echo "class='active'"; }
echo ">";
$link = "index.php?page=" . $a_page["page"];
echo "<a href='$link'>";
echo $a_page["menu"];
echo "</a></li>";
}
?>
</ul>
</div>