Subj : Re: .prototype behaves two different ways (SpiderMonkey)
To   : Jason Straathof <jstraathof@cannospamada.com>
From : Brendan Eich <brendan@meer.net>
Date : Tue Jan 14 2003 10:46 am

Worksforme, demonstration in the js shell using the built-in "it" object:

js> it.noisy = true
true
js> it.color=42
setting its property 0, new value 42
42
js> it.foozle='bar'
resolving its property foozle
adding its property foozle, initial value bar
setting its property foozle, new value bar
bar
js> function S(){}
js> S.prototype = it
resolving its property toString
[object It]
js> S.prototype.barfle = 'huh'
resolving its property barfle
adding its property barfle, initial value huh
setting its property barfle, new value huh
huh

Are you *sure* you have an instance of your built-in class at hand when 
you call new SuperClass(); ?

/be

.