I found errors in the HTML of the recaptcha behavior when validaing against XHTML 1.0 trans, W3C. The input tag has no closing / and there an empty set of tag brackets. These are bolded for your consideration.

"<iframe src=""www.google.com/recaptcha/api/noscript?k=" & m_PublicKey & """ frameborder=""1""></iframe><>" & _
"<textarea name=""recaptcha_challenge_field"" rows=""3"" cols=""40""></textarea>" & _
"<input type=""hidden"" name=""recaptcha_response_field"" value=""manual_challenge"" />" & _

Hello,

You should not worry about this, it is how Google provide the code so there are no problems.

You are so wrong! The errors are the file dmxReCAPTCHA.asp on line 115 and 117. I fixed them and the page now validates. I reported it not because I didn't know what to do but because you need to address this BUG in the extension package. Here is your corrected code:

 GetControl = _
	  "<s" & "cript type=""text/javascript"">" & _
	  "var RecaptchaOptions = {" & _
	  "   theme : '" & theme & "'," & _
		"   lang : '" & language & "'," & _	  
	  "   tabindex : 0" & _
	  "};" & _
	  "</s" & "cript>" & _
	  "<s" & "cript type=""text/javascript"" src=""http://www.google.com/recaptcha/api/challenge?k=" & m_PublicKey & errString & """></s" & "cript>" & _
	  "<noscript>" & _
	    "<iframe src=""http://www.google.com/recaptcha/api/noscript?k=" & m_PublicKey & """ frameborder=""1""></iframe>" & _
	      "<textarea name=""recaptcha_challenge_field"" rows=""3"" cols=""40""></textarea>" & _
	      "<input type=""hidden"" name=""recaptcha_response_field"" value=""manual_challenge"" />" & _
	  "</noscript>"

I always worry when my pages are W3C compliant and so should you.