Has anyone created a library for outputing an image of letters/numbers + form element to make a "is this a human user" verifier?

I have Tong's T4 book, which shows the exact process of outputting an image.

And I've also come across this exchange which mentions some talk of a library..
http://www.tapestryforums.com/images-from-db-vt3971.html

Has the library been made? Should I use Tong's method, or should I use the code pasted in the above link?

Thanks!
mike

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