Checky Plugin for Mozilla based browsers...
"Checky Plug-in is an simple interface for Web content and resource developers to free and commercial online validaton and analysis services. Service-Interfaces available for HTML, XHTML, CSS, RDF, RSS, XML, SGML, WAI, 508, P3P, and various viewer."
http://sourceforge.net/projects/checky/
Shelumi`El
Jordan
S.D.G