diff --git a/system/helpers/captcha_helper.php b/system/helpers/captcha_helper.php
index 373b1af..5fa61e0 100644
--- a/system/helpers/captcha_helper.php
+++ b/system/helpers/captcha_helper.php
@@ -245,7 +245,7 @@
 			return FALSE;
 		}
 
-		$img = '<img '.($img_id === ''? NULL: 'id="'.$img_id.'"').' src="'.$img_url.$img_filename.'" style="width: '.$img_width.'; height: '.$img_height .'; border: 0;" alt=" " />';
+		$img = '<img '.($img_id === '' ? '' : 'id="'.$img_id.'"').' src="'.$img_url.$img_filename.'" style="width: '.$img_width.'; height: '.$img_height .'; border: 0;" alt=" " />';
 		ImageDestroy($im);
 
 		return array('word' => $word, 'time' => $now, 'image' => $img, 'filename' => $img_filename);
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 5dc3650..57a7dc7 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -136,7 +136,7 @@
       - Updated to use `imagepng()` in case that `imagejpeg()` isn't available.
       - Added **font_size** option to allow customization of font size.
       - Added **img_id** option to set id attribute of captcha image.
-      
+
    -  :doc:`Text Helper <helpers/text_helper>` changes include:
 
       - Changed the default tag for use in :func:`highlight_phrase()` to ``<mark>`` (formerly ``<strong>``).
diff --git a/user_guide_src/source/helpers/captcha_helper.rst b/user_guide_src/source/helpers/captcha_helper.rst
index 6e0cfc9..4aacafd 100644
--- a/user_guide_src/source/helpers/captcha_helper.rst
+++ b/user_guide_src/source/helpers/captcha_helper.rst
@@ -34,7 +34,7 @@
 		'expiration'	=> 7200,
 		'word_length'	=> 8,
 		'font_size'	=> 16,
-		'img_id'	=> 'Image id',
+		'img_id'	=> 'Imageid',
 		'pool'		=> '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
 
 		// White background and border, black text and red grid