I gather there is a problem with leaving comments. It seems readers cannot see the field into which they must enter the answer to the captcha. I borrowed the code for this blog's layout from someone (I think there are links at the foot of the page to the author).
I don't know enough xhtml to understand where the issue is, so please bear with me. If anyone thinks they could help and is willing to have a look I would be happy to email them the code.