The form on my website has been there for over a year now and about 2 weeks ago, I started getting tons of submissions through the form to my inbox that are all spam. Can someone tell me how to setup one of those image code features where you have to type in the code you see on the image for it to submit successfully? Do you pay for this service to a third party or is it something I can do on my own? I know how to create an image but how do you hide the secret code so that spammers can't find it? Thank you!
You can download mikes contact script from themike dot com. It is gpl licensed and includes a visual captcha. Modding it for your purpose might be easier than adding your own.