The answer would depend on how far (or how complicated) you're
going.  If you just want to add some interactivity to your form, I don't
think you would need to spend a lot of time to support NN4 as well.  Even
supporting <layer> vs <div> isn't that diffcult and doesn't take much time.

	But if you're doing almost a whole application, I agree with Robert
that you'd better forget NN4.

	As my personal experience, I develop only for NN6+ and IE5.5+ for my
company's web application.  I don't even support IE4 and IE5.0 because their
CSS support is very buggy and broken.  I even lean to support NS6+ because
the web application involves displaying reporting and if you've ever had
occasion to print webpages containing tables, you should have noticed that
the result from IE isn't very pleasing -- tables are broken in the middle,
headers can't repeat or column widths are totally wrong, etc.

	As to DOM, Robert has said everything :-)

> -----Original Message-----
> From: Mark Almirante [mailto:almirantemark@y...] 
> Sent: lundi 3 mars 2003 07:03
> To: javascript
> Subject: [javascript] Cross browser scripting
> 
> 
> I'm a student web developer and want to know if professional 
> developers who create cross-browser client-side scripts, 
> ignore NN4 browser?  Is it still being used today? Do clients 
> demand that web pages you create are compatible with NN4 and 
> its 'layer' implementation of DHTML or can I completely 
> ignore it and just focus on NN6,NN7,IE4/5/6? 
> 
> Also, I'm using a technique I found in one of the books I 
> read on DHTML that involves creating an external javascript 
> file that basically detects the DOM used by the client and 
> returns the corresponding DOM addressing scheme (whether 
> 'document.all' or 'document.getElementById') to be used in my 
> DHTML code.  Is this an effective way of creating 
> cross-browser DHTML, and is it being used in the real world 
> by professional developers.
> 
> Thanks so much for responding.