alternate or replacement for recaptcha

I have implemented reCaptcha in my site and it is not working in IE vesions. I am currently looking for other captcha services which are similar(service providers / API calls) to reCpatcha.

Could anybody tell me the replacement or alternat开发者_如何学Goe for reCaptcha human verification?

any help on this will be helpful to me...

Thanks in advance...

Regards, Raaj.

You could try more usable and secure image-identification CAPTCHAs such as these - www.picatcha.com/pixcaptcha