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/*-----------------------------------------------------------------------------
* Navigator
*  Example Source
document.write(
(Navigator.isWinIE())  ? 'IE' + Navigator.isWinIE() + ' (Win)' :
(Navigator.isMacIE())  ? 'IE' + Navigator.isMacIE() + ' (Mac)' :
(Navigator.isGecko())  ? 'Mozilla (' + Navigator.isGecko() + ')' :
(Navigator.isSafari()) ? 'Safari (' + Navigator.isSafari() + ')' :
(Navigator.isKDE())    ? 'KDE (' + Navigator.isKDE() + ')' :
(Navigator.isOpera())  ? 'Opera' + Navigator.isOpera() :
(Navigator.isNN4())    ? 'NN4' :
"I don't know."
);
*-------------------------------------------------------------------------- */

var Navigator = {
_getVersion: function (a, b) {
var t = navigator.userAgent.split(a)[1];
return (t) ? t.split(b)[0] : false;
},
isOpera: function () {
return (
(window.opera) ?
(document.createElementNS) ?
(document.createCDATASection) ?
(document.styleSheets) ? 9 : 8
: 7
: 6
: false
);
},
isSafari: function () {
return (document.createCDATASection && document.createElementNS) ? Navigator._getVersion('AppleWebKit/', '(') : false;
},
isKDE: function () {
return (document.createCDATASection && document.createElementNS) ? Navigator._getVersion('Konqueror/', ';') : false;
},
isGecko: function () {
return (document.createCDATASection && document.createElementNS) ? Navigator._getVersion('Gecko/', ' ') : false;
},
isNN4: function () {
return (document.layers && typeof document.layers == 'object') ? true : false;
},
isWinIE: function () {
return (
/*@cc_on @if (@_win64 || @_win32 || @_win16)
(document.getElementsByTagName) ?
(@_jscript_version > 5.6) ? 7 :
(@_jscript_version == 5.6) ? 6 :
(@_jscript_version == 5.5) ? 5.5 :
5
: 4
@else@*/false/*@end @*/
);
},
isMacIE: function () {
return (
/*@cc_on @if (@_mac && (@_PowerPC || @_mc680x0))
(document.getElementsByTagName) ? 5 : 4
@else@*/false/*@end @*/
);
}
};

source