add multilanguage support (currently EN and DE)

lang.php

@@ -0,0 +1,42 @@
+<?php
+session_start();
+header('Cache-control: private'); // IE 6 FIX
+
+if(isSet($_GET['lang']))
+{
+$lang = $_GET['lang'];
+
+// register the session and set the cookie
+$_SESSION['lang'] = $lang;
+
+setcookie("lang", $lang, time() + (3600 * 24 * 30));
+}
+else if(isSet($_SESSION['lang']))
+{
+$lang = $_SESSION['lang'];
+}
+else if(isSet($_COOKIE['lang']))
+{
+$lang = $_COOKIE['lang'];
+}
+else
+{
+$lang = 'en';
+}
+
+switch ($lang) {
+  case 'en':
+  $lang_file = 'lang.en.php';
+  break;
+
+  case 'de':
+  $lang_file = 'lang.de.php';
+  break;
+
+  default:
+  $lang_file = 'lang.en.php';
+
+}
+
+include_once 'lang/'.$lang_file;
+?>