Telling your users they are using the wrong browser is extremely rude. Design your site to be any browser friendly.
http://www.anybrowser.org/campaign/
'Anyone who slaps a 'this page is best viewed with Browser X' label on a Web page appears to be yearning for the bad old days, before the Web, when you had very little chance of reading a document written on another computer, another word processor, or another network.'
Paul Crowley, ciphergoth.org
-Tim Berners-Lee in Technology Review, July 1996
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