diff -urN captcha.old/image_captcha/image_captcha.module captcha/image_captcha/image_captcha.module
--- captcha.old/image_captcha/image_captcha.module	2008-03-08 21:49:12.000000000 +0200
+++ captcha/image_captcha/image_captcha.module	2008-03-08 21:49:33.000000000 +0200
@@ -136,7 +136,7 @@
         $result['solution'] = $code;
         $result['form']['captcha_image'] = array(
           '#type' => 'markup',
-          '#value' => '<img src="'. check_url(url("image_captcha/$seed")) .'" />',
+          '#value' => '<img src="'. check_url(url("image_captcha/$seed")) .'" alt="'. t('Image CAPTCHA') .'" title="'. t('Image CAPTCHA') .'" />',
           '#weight' => -2,
         );
         $result['form']['captcha_response'] = array(