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CAPTCHA Images in PHP

Pikachu

Kelp is good! Yum yum!
Pronoun
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First, see here for the chatbox. As you can see, the CAPTCHA is a random image of a Pokémon, except you can post a message without entering the name of the Pokémon.

There are nine images of Pokémon (first nine Pokémon of National Dex). How do I make a CAPTCHA with those?
 
On the server side, just put an if statement to check if the user has entered the name of the Pokémon around the message-posting code? ?_? Is there something I'm missing?
 
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