Yes. And as you can see from that code, he updates only the captcha area, 
not the whole form itself, as I suggested 2 posts ago. Your reply even said 
that the code I gave you "just causes the captcha to be redrawn on its 
own." And that should be fine, assuming the captcha system you are using 
uses the session to store the correct answer and to check it.

/uses/add -> captcha is stored, view is echoed and captcha drawn
user clicks reload
/users/reload_captcha -> captcha is stored, view is returned and overwrites 
contents of #captchaID
user clicks submit
/users/add -> checks captcha validity

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