return the right sub language

1 files changed, 6 insertions, 5 deletions

diff --git a/lib.php b/lib.php
index bde2ee9..28b72cf 100644
--- a/lib.php
+++ b/lib.php
@@ -110,10 +110,8 @@ function _mgnav_style()
 */
 function _lang_check($s = null)
 {
-    if (!is_null($s)) {
-        $sub = explode('-', $s);
-        $sub = strtolower($sub[0]);
-    }
+    if (is_null($s))
+        return 'en';
 
     $supported = array(
         'cs',
@@ -134,8 +132,11 @@ function _lang_check($s = null)
     if (in_array($s, $supported))
         return $s;
 
+    $sub = explode('-', $s);
+    $sub = strtolower($sub[0]);
+
     if (in_array($sub, $supported))
-        return $s;
+        return $sub;
 
     return 'en';
 }