Probably you don't need them.
Those two were Netscape inventions, and IE made the sensible choice of
following them.
The Window object model has never been standardised (the concept of a
window not actually existing in Document Object Models) The SVG WG
recognised that standardisation was useful, and have controversially
started down the route of doing so (the existence of a UA where the
global object wasn't called window probably convinced them of the
need!)
The WHAT-WG (if they're still alive posting seems to have ceased) are
also working on standardising this.
Both efforts at standardisation though are purely ratifying the
existing de-facto standards (which are tough of course - what do you
do when there's minor differences in the implementations?)
And this MS JScript is not JavaScript at all.
Hmm, that's misleading.
So you have two choices - loose 90% of users or follow M$
((
No, not at all, you certainly can't ignore JScript, but you can easily
author script that works fine in lots of browsers without any special
work.
Jim.