[Xsltforms-support] Change instance via JavaScript?

[<st...@sa...>]

Hello,

I have an XForm in one page which I would like to update from
either a second page hosted by an iframe within the first,
or from a popup opened by the page.

I need to change an instance value in the parent form.  I can
activate an xforms:trigger from an external page, but have not
been able to see how to set the value with which to update the
instance.

So, I thought maybe updating the instance directly and then
rebuild/refresh would work, but with that approach I can get
as far as updating the nodeValue and then the rebuild/refresh
does not update the display.

What I would like to do is the kind of thing exemplified by
some sample code (snarfed from the net) which is at:

  http://oracc.museum.upenn.edu/p2/changeme.xml

Any ideas?

Thanks,

  Steve