Using a CAPTCHA within a jQuery UI Dialog confirmation box

I have a JQuery UI Dialog confirmation box that I need to make "extra sure" that the user really means it when they click "Confirm", so I think I want to use a CAPTCHA to capture this confirmation. Basically, disable the "Confirm" button in the popup until the entered text matches the CAP开发者_高级运维TCHA image.

Any ideas on how to do this, or even a better way to do this without resorting to a silly second "Are you really really really sure?" popup?

If you want to resolve a CAPTCHA only on the client side, they are very easily bypassed. Do not trust a browser.

So you really want to do the checking on the server. How to include it, depends on the captcha you choose to use.

If it is not a about a captcha, but making users think about "the right choice": What I did is giving users think time: Enabling the submit button only after a certain time. But displaying a "think timer" countdown. (btw: users hate it, but at least they think about their choice and not how to read a captcha).

I think implementing a captcha will be extra work for you (and more annoyance for your users). Perhaps it's better to just throw:

return confirm('Submit the form now?'); 

Once they click confirm on the UI form.