More improvements to security

Change-Id: Ib864df3b2d36f22a1e070829aabbaa8c1ce7bd4c
diff --git a/main.php b/main.php
index ac913a3..c63556a 100644
--- a/main.php
+++ b/main.php
@@ -59,7 +59,7 @@
 	<body>
 		<div id="outter-container">
 			<div id="inner-container">
-				<a href="./" class="goback">Canvi d'usuari</a><br />
+				<a href="/php/logout.php" class="goback">Tancar sessió</a><br />
 				<h2>Hola <name id="user_name"><?=Security::htmlsafe($user->nom())?></name>,</h2>
 
 				<div class="formulari_contrasenya">