Add captcha feature to comments-form. Update posts Controller's post() func to use the 'captcha' helper. Update the comments controller to compare the captcha word stored in sesssion , with the captcha word sent via  by user - so only comments are saved when the two words match. Add captcha image display and input field to the comments form on post.php View. Fixed .htaccess in CI project root so captcha images dont appear broken in browser