How do I change/spoof the browser ID (agent)?

ik04 <[email protected]>
Newsgroups gmane.comp.mozilla.devel.prefs
Organization Road Runner - Texas
Message-ID <[email protected]> 
Howdy,

I need to spoof Netscape 6.1 or 4.0X.  I'm running Mozilla 1.4 (Linux)

Any help?
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