Add Captcha to HTML Website Forms

I would like you to please add CAPTCHA to 2 HTML website forms (above the submit button and below the "Please enter your message" field): 1. [login to view URL] and 2. [login to view URL] The CAPTCHA should work seamlessly in a similar way to this example: [login to view URL] Please ensure it works seamlessly in all browsers including Internet Explorer, Firefox and Google Chrome.