Someone guided me to add @hsep and @vsep for the lines
Sorry, when I said this I failed to remember that @hsep and @vsep
haven't been implemented in texinfo.tex, only makeinfo.
So I don't think there's any way to get rules in tables currently.
(Short of using @tex and \halign.)
@image for the pictures
@image is described in the manual.
You don't say what version you have.
You want version 4.0.
The manual is online at http://texinfo.org/ among other places.
Hope this helps,
