The main problem caused by the incompatibility of the Microsoft and Netscape versions of DHTML is that they will often throw up error messages or even lock up your browser if the "wrong" browser is used. One way round this is to have separate pages and to redirect according to which browser is being used.
The link below sends you to a switcher page, "IE4sw.htm". That page checks to see if the browser is IE4, and if so, redirects it to the special page for IE4. If the browser isn't IE4, it falls through to other content in IE4sw.htm (this will also trap browsers that don't support JavaScript at all).
Obviously, the script will work equally well in reverse, with Netscape 4.0 being the browser redirected.
If you are using IE4 at the moment, I suggest you fire up another browser to check the script with that as well. Note: I suggest you copy/paste the URL of this page directly into the browser to save time. The URL is: