diff --git a/include/utils.php b/include/utils.php
new file mode 100644
index 0000000..8b685a5
--- /dev/null
+++ b/include/utils.php
@@ -0,0 +1,27 @@
+<?php
+function get_protocol() :string {
+    if(isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on')
+        return "https://";
+    else
+        return "http://";
+}
+
+/* Pass either 'http://' or 'https://' asc parameter*/
+
+function base_url(string $protocol = 'http://') {
+    // Append the host(domain name, ip) to the URL.
+    $url = $protocol . $_SERVER['HTTP_HOST'];
+    return $url . '/';
+}
+
+function parent_url(string $protocol = 'http://') : string {
+    // Append the host(domain name, ip) to the URL.
+    $url = $protocol . $_SERVER['HTTP_HOST'];
+    // Append the requested resource location to the URL
+    $url .= $_SERVER['REQUEST_URI'];
+    // If URL is already the base
+    if (base_url($protocol) === $url)
+        return $url;
+    return dirname($url);
+}
+
diff --git a/index.php b/index.php
index a63c6f9..3fe319b 100755
--- a/index.php
+++ b/index.php
@@ -3,7 +3,9 @@
 <?php
 
 include 'include/header.php';
+include 'include/utils.php';
 
+/* Functions */
 function link_from_file(string $filename, string $name = null, string $css_class = null ) : string {
 	// Check if css_class is null
 	$css_class = $css_class ? " class=\"$css_class\"" : '';
@@ -31,29 +33,21 @@ function filter_files_dir($files_array, string $path) : array {
 	return $ret_array;
 }
 
+
+// HTML Head
 echo($header);
 echo("\n");
 
-?>
-<body>
-	<h1>Magatzem de Dusk</h1>
-<?php
-
-// Debug
-//var_dump($_SERVER);
-// Debug
-
-// Debug
-//var_dump($files_in_folder);
-// Debug
-
+/* Misc. Variables */
 $not_found_error = '<h1>File not found, error 404</h1>';
 
 $basedir = 'content';
 $request_uri = $_SERVER['REQUEST_URI'];
 
 $path = $basedir . $request_uri;
+/**/
 
+// Check if URI is correct
 if(!is_dir($path)) {
 	echo($not_found_error);
 	die();
@@ -62,6 +56,14 @@ if(!is_dir($path)) {
 $files_in_folder = scandir($path);
 $resource_array = filter_files_dir($files_in_folder, $path);
 
+/* Debug */
+/* var_dump($_SERVER);
+ * var_dump($files_in_folder); */
+
+?>
+<body>
+<h1>Magatzem de Dusk</h1>
+<?php
 // Show folder links
 {
 	if(!empty($resource_array['dir'])) {
@@ -92,6 +94,18 @@ echo("\n");
 
 echo("\n");
 
+$base_url = base_url();
+$parent_url = parent_url();
+
+//Navigation
+echo <<<NAV
+<nav>
+<ul>
+<li><a href={$base_url}>Inici</a></li>
+<li><a href={$parent_url}>Arrere</a></li>
+</ul>
+</nav>
+NAV;
 ?>
 </body>
 </html>
