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I suggest creating a stylesheet just for NN4, using pixel sizing. Then create another "generic" stylesheet for all the later browsers using ems.
Bring in the two stylesheets in the <head> like this:
<link rel=stylesheet href="http://example.com/nn4.css">
Browser specific CSS [webmasterworld.com]
Because NN4 doesn't support @import, it will get pixel sizes. Everything else will get the em sizing that comes in later in the cascade.