captcha code not working

I have designed the comments box for getting comments. Instead of using captcha plugins, i have prepared custom captcha with 5 digit number. When I submit the details, still I getting error page. I have checked various sites in Google but could not find the correct answer. 1. comments.html - Comment box for comments 2. captcha.php - Custom captcha with 5 digit code 3. submit.php - for processing the code 4. error.html - error page for wrong entry 5. thank.html - Page on submitting successful I am unable to sort-out where the mistake is. Kindly help me in this regards. The sources codes of comments.html and submit.php is given below. =========COMMENTS.HTML==============
Name:
Email:
Comments:

  • 昵称 (必填)
  • 邮箱 (必填)
  • 网址

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