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indexOf

var isIE = sUserAgent.indexOf(“compatible”) > -1

&& sUserAgent.indexOf(“MSIE”) > -1

&& !isOpera;

var isMinIE4 = isMinIE5 = isMinIE5_5 = isMinIE6 = false;

if (isIE) {

var reIE = new RegExp(“MSIE (\\d+\\.\\d+);”);

reIE.test(sUserAgent);

var fIEVersion = parseFloat(RegExp[“$1”]);

isMinIE4 = fIEVersion >= 4;

isMinIE5 = fIEVersion >= 5;

isMinIE5_5 = fIEVersion >= 5.5;

isMinIE6 = fIEVersion >= 6.0;

}

var isMoz = sUserAgent.indexOf(“Gecko”) > -1

&& !isKHTML;

var isMinMoz1 = sMinMoz1_4 = isMinMoz1_5 = false;

if (isMoz) {

var reMoz = new RegExp(“rv:(\\d+\\.\\d+(?:\\.\\d+)?)”);

reMoz.test(sUserAgent);

isMinMoz1 = compareVersions(RegExp[“$1”], “1.0”) >= 0;

isMinMoz1_4 = compareVersions(RegExp[“$1”], “1.4”) >= 0;

isMinMoz1_5 = compareVersions(RegExp[“$1”], “1.5”) >= 0;

}

var isNS4 = !isIE && !isOpera && !isMoz && !isKHTML

&& (sUserAgent.indexOf(“Mozilla”) == 0)

&& (navigator.appName == “Netscape”)

&& (fAppVersion >= 4.0 && fAppVersion < 5.0);

var isMinNS4 = isMinNS4_5 = isMinNS4_7 = isMinNS4_8 = false;

if (isNS4) {

isMinNS4 = true;

isMinNS4_5 = fAppVersion >= 4.5;

isMinNS4_7 = fAppVersion >= 4.7;

isMinNS4_8 = fAppVersion >= 4.8;

}

var isWin = (navigator.platform == “Win32”) || (navigator.platform == “Windows”);

var isMac = (navigator.platform == “Mac68K”) || (navigator.platform == “MacPPC”)

|| (navigator.platform == “Macintosh”);

var isUnix = (navigator.platform == “X11”) && !isWin && !isMac;

var isWin95 = isWin98 = isWinNT4 = isWin2K = isWinME = isWinXP = false;

var isMac68K = isMacPPC = false;

var isSunOS = isMinSunOS4 = isMinSunOS5 = isMinSunOS5_5 = false;

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Browser and Operating System Detection

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