<ul id="nav">

<?php

	define('BASE', 'data/');

	echo '    <li><a href="."'. (empty($_GET['path']) ? ' id="selected"' : '') .">Home</a></li>";
	// build nav tree
	echo '    '. navtree("") ."\n";
?>


  </ul>

<?php



/* recursive function creates the output for the nav tree */
function navtree($root) {

	if (!empty($root)) {
		$root .= '/';
	}
	$files = scandir(BASE."$root");
	$return = '';
	foreach ($files as $f) {
		if (!is_dir(BASE."$root$f") || substr($f, 0, 1) == '.') {
			continue;
		}
		$return .= "<li><a href=\"?path=$root$f\"". ((isset($_GET['path']) && $_GET['path'] == "$root$f") ? ' id="selected"' : '') .">$f</a>";
		$subtree = navtree("$root$f");
		if (!empty($subtree)) {
			$return .= "<ul>$subtree</ul>";
		}
		unset($subtree);
	}
	$return .= '</li>';
	return $return;
}

?>