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| Price: Commercial | Publisher: Office Site 
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PHP Script Codes > AJAX Form Pro v2: Now with Control Panel
Unlike many AJAX CAPTCHAs out there that rely on JavaScript as an Anti-spam measure and have a medium security level, the one I have chosen to implement uses PHP to securely generate and register the required code in the background. Moreover, you can specify whether to show letter, numbers or both on the verification image.
Features: http://www.econtactform.com/features