--- recaptcha.module~	2009-05-22 00:15:39.000000000 -0400
+++ recaptcha.module	2009-06-16 15:14:08.000000000 -0400
@@ -167,7 +167,11 @@ function recaptcha_captcha() {  
 
           // Localization support.
           global $language;
-          $js .= ", lang:'" . $language->language . "'";
+          if ($language->language) {
+            // reCAPTCHA uses two-character language codes, so 'pt-br' must be
+            // passed as 'pt' (cf. http://wiki.recaptcha.net/index.php/I18n)
+            $js .= ", lang : '". substr($language->language, 0, 2) ."'";
+          }
 
           // Add support to display the custom theme
           if ($recaptcha_theme == 'custom') {