Inline MIME display -- when and when not?

[Lloyd Zusman <ljz@asfast.com>]

I just installed `pgnus-0.56' along with the recommended `w3' stuff.
I'm running XEmacs 20.4.

In an earlier `pgnus' release (I'm not sure which ... perhaps in
the 0.40-0.50 range), I noticed the following behavior:

I receive a message with multipart/mixed stuff in it, and each part
contains a MIME-encoded jpeg image (image/jpeg).  When I use the `b'
command with a numerical prefix to view the N-th MIME part, the image
gets rendered right inside my XEmacs article buffer.

Now, when I'm accessing the very same message with the very same jpeg
images using 0.56 with the `w3' stuff, `xv' gets fired off to view the
images when I use the `b' command.

The only thing which I changed at my site is the version of `pgnus'
and the addition of the recommended `w3' stuff.  Everything else is
the same.

I'd like to be able to specify that these jpeg images get viewed
inline (within my XEmacs article buffer) and not via `xv', but I don't
know how to control this behavior.  Is this done via `pgnus' or via
`w3'?  I've looked through the latest 0.56 `info' documentation, and I
can't find anything about this.  Perhaps this is something which was
discussed in recent weeks here in the mailing list, but if so, I
missed it.

Could anyone steer me to the proper documentation about this, or
if none exists, to point me to the proper functions and variables
which control this behavior?

Thanks in advance.

-- 
 Lloyd Zusman
 ljz@asfast.com