Two things comes to my mind:

1) CHM (compiled HTML) -- but this is MS proprietary file format (for 
its
WebHelp system).  Even IE can't open this kind of files (luckily).

2) MHT that you're talking about :
http://dsv.su.se/jpalme/ietf/mhtml.html
This is using MIME multipart technique to encode content elements to 
ASCII.
This is supported by both IE (at IE5, I think) and Mozilla (thus, N6+). 
 I
haven't read through that reference, so I have no idea how to generate 
it
except using IE.

> -----Message d'origine-----
> De : Fabrice vanderhaeghen [mailto:f_vanderhaeghen@i...]
> Envoy=C3=A9 : mercredi 30 octobre 2002 19:34
> =C3=80 : javascript
> Objet : [javascript] embedding an image into a HTML page
>
>
> Hi,
>
> Is how can I physically save an image into an HTML page to be
> able to open
> this page without needing the image (like a save as web
> archive .mht file
> do)
>
> thanks.