>  Given that you're not familiar enough with these specific 
>  elements, where would *you* go to figure out which interfaces 
>  are implemented by my surface object (it's a <browser> XUL 
>  element) and do you have a snippet of code that exemplifies 
>  the retrieval of an object (via getElementById(), and the 
>  application of that interface so that the
>  goBack() method can be called?

I'd start simply by printing a repr() of the fetched object.  An XPCOM
object will generally list the interfaces known on the object.  Or, I'd
approach it from the other direction - determine the interface I need and
try to work out, via lxr, which objects implement that interface.  Sadly,
there are still some facilities that are exposed in a JS specific way - eg,
window.open() is such a method - but assuming you are using the nsdom work,
it should be possible to trick things into executing JS code (I think I
emailed some details on that a few weeks ago).

Sadly I'm travelling at the moment and don't even have a mozilla source tree
on the laptop I have in front of me.

Cheers,

Mark

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