(1) Add the following line to your .Xdefaults (or .Xresources):
Netscape*documentFonts.charset*adobe-fontspecific: iso-8859-1
(2) $ xrdb .Xdefaults or else restart the X server.
(3) Restart Netscape.
For more details, visit the tex2html page at
http://hutchinson.belmont.ma.us/tth/