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Using the Asirra Project
This example uses the (Beta) Asirra Project to determine if the form-filler is human or machine. Asirra (Animal Species Image Recognition for Restricting Access) is a HIP (Human Interface Proof) that works by asking users to identify photographs of cats and dogs.
If the cats are selected incorrectly, the message is not sent - but, unlike here, no indication of failure should be given to the user. In this demonstration, if the selection is wrong, an alert is given.
For Asirra to function for the user JavaScript must be running in the browser, and also requires
server side coding. More information is at http://research.microsoft.com/asirra/
This page shows what happens when JavaScript is disabled.
