How to use CAPTCHA

In my web form, users can insert data.
But I like to add a CAPTCHA.
What is the easiest way to do it? Any example is appreciated.
Thanx

I read Patrick Wolf's blog entry which describes using CAPTCHA for a specific APEX page. Very interesting. Has anyone ever used it as an authentication scheme? For example, instead of a person entering their Application Express username and password, I'd like to have a CAPTCHA as the authentication to the application. Trying to keep those non-human types out!
Thanks,
John

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Hi John ,
Thankx for the reply ..
i am getting the following compilation error *(Error: Attribute: halign is not a valid attribute name)* while doing that .
i have written the code as follows...
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Re: Why Function GUI_DOWNLOAD can create XML file but not a flat file?
Award points if useful
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How to use CAPTCHA

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