How do you get the HREF out of an nsIDOMNode

[Erik Walter]

So I can get a nsIDOMNode from the nsIDOMHTMLCollection that I get from 
the nsIDOMHTMLDocument after I call GetLinks().  But I can't figure out 
how to get the href attribute out of that nsIDOMNode.

Any thoughts?  Seems like this ought to be a trivial task...

Erik

P.s. and while I'm at it, any thoughts on how to determine the position 
(x,y) of that nsIDOMNode within the window?