Without code for Netscape, your only serving like 90% or so of Internet users. So if your designing an important bank page or something, you probably need to implement script for both browsers, and others as well. Much of JavaScript is compatible with IE and Netscape. What kind of coding are you needing to do? Some things are impossible with Netscape.
Will you lose your job? Depends on what your client (or boss) wants, I suppose :-)
HTH,
Snib
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