[PHP] Mining protection / security code confirmation

[Ho!Tech Guy]

I have a classified ad section on my site which uses a privacy mail 
function so users don't have to make their email address public. Recently 
though, the site has been mined (I assume) and spam is being sent.

I was thinking that a "security code confirmation" type script would be 
good where the user has to enter the number shown in a graphic. Am I on the 
right track? If so, can anyone recommend a specific script?

Any advice would be gratefully received.
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