emacs-w3m save html

[mr.sparkle]

hello!
I just started using emacs-w3m (1.3.2) and I love it! However,I can't figure
out a straightforward way to save web pages as html. The way I do it
now is press \ to get the source and then save the buffer. When I
save the buffer with an .html extension, w3m closes and I get dropped
into an html editing buffer, which is not the behavior I want. So I
have to save the buffer without the .html extension and go back later
and rename it, which is a bit of a pain. I've read the manual, and
esc-s works in w3m, but not emacs-w3m. Is there an equivalent for
esc-s in emacs-w3m?
thanks!
emacs version 21.2.1