Thanks for that, Gwyrgyn! :up:
I did a quick checkup, and found the applicable notes here:
http://www.w3.org/MarkUp/2004/xhtml-faq#docwrite
since AJAX is a "standards-based presentation using XHTML and CSS" this would obviously affect it.
I'll go through the code tomorrow and do a check; then if it all works and I'm happy with it I'll update the product.
Many thanks again... I hope the above will explain it for others who may come across the same situation