Free to All:
html source code is viewable
on anypage on the net.You can copy this source code
from any page that you like and learn from it. What you won't get are the
pictures, sound, and animation files, but some of these can also be copied to
your
computer as well.
The extent that you use
someone else's work is an ethical dilema. Artistic license applies.
Use it, but change it.