Thanks for the response.
My understanding is that Yandex is only used by Opera for malware. I also appear to be on the separate blacklist for suspected fraud. How do I get my website removed from the blacklist for suspected fraud?
I have just registered for Yandex.Webmaster, and have confirmed that my website is free of malware. I can do nothing about malware on other websites under tripod.com, other than to e-mail Tripod which I have done.
Many thanks,
Martin