Whilst I admire your free software spirit for licensing your
web pages GPL you’ve kinda got the wrong license. The GPL is designed
for CODE and is worded accordingly, using it for documentation is kinda legally
shakey to say the least because you leave too much open to interpretation. If you
want a license that follows the same spirit as the GPL but is designed for
documentation the FSF has the GFDL http://www.gnu.org/copyleft/fdl.html
that would probably be more appropriate for your needs.
M Pollard