a simple CAPTCHA plugin for Ruby on Rails

We are currently using ReCaptcha on our website (developed with Ruby on Rails)which we think is coming in the way of our users (see here: http://www.pakwheels.com/used-cars/add_car).

We want an easier Captcha, perhaps something which is simpler (3 or 4 letters or numerals). Please see the attached screen shot for example of something which i want.

NOTE: please note that the plugin should work on an Ruby on Rails website
simple-Captcha.jpg
ErdosExcellenceAsked:
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remixedcatCommented:
have you gave this one a shot?

http://expressica.com/simple_captcha/

I think you can define the amount of characters the user will need to type in with the code easy.
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JESiiCommented:
Besides that one, there's also:
     http://www.grails.org/Simple+Captcha+Plugin which has a lot of blog mentions
or
     http://www.railslodge.com/plugins/101-simple-captcha
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ErdosExcellenceAuthor Commented:
i independently found the same captcha from my google search, but seeing that someone else has recommended the same gave some reassurance.
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remixedcatCommented:
Glad to assist! ;-)
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