This is my preferred sniffer.  Not only you could make it as tight as 
you
like, or as complete as you wish, it explains clearly things.
http://www.mozilla.org/docs/web-developer/sniffer/browser_type.html

Robert, maybe you could put this link in the FAQ.

> -----Message d'origine-----
> De : Earl Robb [mailto:erobb@b...]
> Envoy=C3=A9 : mardi 24 d=C3=A9cembre 2002 02:53
> =C3=80 : javascript
> Objet : [javascript] Re: NN4.6 Events HTML
>
>
> If you think its goofie in NN4.6 try NN6.0 whole different set of
> problems.  Looks like NN browser has an odd redraw using
> JavaScript to
> reset text box values. Im starting to wonder if this is
> possible in NN.
>
> I want to be sure my JS only displayed on NN6> or IE55> Does
> anyone have a
> tight sniffer that excludes Opera, webtv ect.  Server side ASP/JSP?
>
> Thanks,
> Earl