var myBrowser = "Browser: Unknown";
var myOS = "OS: Unknown";
var sUserAgent = navigator.userAgent; // GETS THE USERAGENT STRING REPORTED BY BROWSER.
var fAppVersion = parseFloat(navigator.appVersion); // GETS THE APPVERSION STRING REPORTED BY BROWSER.

function compareVersions(sVersion1, sVersion2) {
    // SPLITS STRING BY . AND STORES PIECES IN ARRAYS...
	var aVersion1 = sVersion1.split(".");
    var aVersion2 = sVersion2.split(".");
    
    if (aVersion1.length > aVersion2.length) {
        // IF aVersion1 ARRAY IS LARGER, FILL aVersion2 ARRAY WITH ZEROS UNTIL SAME SIZE...
		for (var i=0; i < aVersion1.length - aVersion2.length; i++) {
            aVersion2.push("0");
        } // END for.
    } else if (aVersion1.length < aVersion2.length) {
        // IF aVersion2 ARRAY IS LARGER, FILL aVersion1 ARRAY WITH ZEROS UNTIL SAME SIZE...
		for (var i=0; i < aVersion2.length - aVersion1.length; i++) {
            aVersion1.push("0");
        } // END for.
    } // END if/else/if.
    
    for (var i=0; i < aVersion1.length; i++) {
        // LOOP THROUGH ARRAYS...
		if (aVersion1[i] < aVersion2[i]) {
            // IF VERSION IN aVersion1 IS SMALLER THEN RETURN -1.
			return -1;
        } else if (aVersion1[i] > aVersion2[i]) {
            // IF VERSION IN aVersion1 IS LARGER THEN RETURN 1.
			return 1;
        } // END if/else/if.
    } // END for.
    
	// IF VERSIONS ARE THE SAME THEN RETURN 0.
    return 0;
} // END function compareVersions(sVersion1, sVersion2).


// *************************************************  DETECTS OPERA BROWSER  ***************************************************
var isOpera = sUserAgent.indexOf("Opera") > -1; // CHECKS IF BROWSER IS OPERA, WHICH ALWAYS CONTAINS THE STRING "Opera".
var isMinOpera4 = isMinOpera5 = isMinOpera6 = isMinOpera7 = isMinOpera7_5 = false; // SETS DEFAULT VALUES.

if (isOpera) {
	var fOperaVersion;
    if(navigator.appName == "Opera") {
        // OPERA IS NOT IN DISGUISE, SO THE CORRECT OPERA VERSION IS CONTAINED IN fAppVersion...
		fOperaVersion = fAppVersion;
    } else {
        // OPERA IS IN DISGUISE, SO GET THE CORRECT OPERA VERSION WHICH COMES AFTER THE STRING "Opera" AND IS 1+ NUMBERS FOLLOWED BY 1+ NUMBERS.
		var reOperaVersion = new RegExp("Opera (\\d+\\.\\d+)");
        reOperaVersion.test(sUserAgent);
        fOperaVersion = parseFloat(RegExp["$1"]);
    } // END if/else.
	// SET MIN OPERA VERSION NUMBER...
    isMinOpera4 = fOperaVersion >= 4;
    isMinOpera5 = fOperaVersion >= 5;
    isMinOpera6 = fOperaVersion >= 6;
    isMinOpera7 = fOperaVersion >= 7;
    isMinOpera7_5 = fOperaVersion >= 7.5;
	myBrowser = "Opera "+ fOperaVersion;
}


// *************************************************  DETECTS KHTML- SAFARI AND KONQUEROR BROWSERS  ***************************************************
// SEARCH FOR AT LEAST ONE OF THE FOLLOWING: "KHTML", "Konqueror", or "AppleWebKit" BECAUSE COMBOS OF THESE APPEAR IN THE STRING...
var isKHTML = sUserAgent.indexOf("KHTML") > -1 
              || sUserAgent.indexOf("Konqueror") > -1 
              || sUserAgent.indexOf("AppleWebKit") > -1; 
              
var isMinSafari1 = isMinSafari1_2 = false;
var isMinKonq2_2 = isMinKonq3 = isMinKonq3_1 = isMinKonq3_2 = false;

if (isKHTML) {
    // IF IT IS A KHTML BROWSER, THEN DETERMINE WHICH ONE- EITHER "AppleWebKit" FOR SAFARI OR "Konqueror" FOR KONQUEROR...
	isSafari = sUserAgent.indexOf("AppleWebKit") > -1;
    isKonq = sUserAgent.indexOf("Konqueror") > -1;
// ****************************************************   DETECTS SAFARI BROWSER  *******************************************************
    if (isSafari) {
        // IF SAFARI THEN EXTRACT THE APPLEWEBKIT NUMBER (Apple suggests using this instead of Safari build number)...
		var reAppleWebKit = new RegExp("AppleWebKit\\/(\\d+(?:\\.\\d*)?)");
        reAppleWebKit.test(sUserAgent);
        var fAppleWebKitVersion = parseFloat(RegExp["$1"]);
		// SET MIN SAFARI(APPLEWEBKIT) VERSION NUMBER...
        isMinSafari1 = fAppleWebKitVersion >= 85;
        isMinSafari1_2 = fAppleWebKitVersion >= 124;
		myBrowser = "Safari "+ fAppleWebKitVersion;

// ****************************************************   DETECTS KONQUEROR BROWSER  *******************************************************
	} else if (isKonq) {
        // IF KONQUEROR THEN EXTRACT THE VERSION NUMBER...
		var reKonq = new RegExp("Konqueror\\/(\\d+(?:\\.\\d+(?:\\.\\d)?)?)");
        reKonq.test(sUserAgent);
        // SET MIN KONQUEROR VERSION NUMBER...
		isMinKonq2_2 = compareVersions(RegExp["$1"], "2.2") >= 0;
        isMinKonq3 = compareVersions(RegExp["$1"], "3.0") >= 0;
        isMinKonq3_1 = compareVersions(RegExp["$1"], "3.1") >= 0;
        isMinKonq3_2 = compareVersions(RegExp["$1"], "3.2") >= 0;
		myBrowser = "Konqueror " + RegExp["$1"];
    } // END if/else/if.
    
} // END if(isKHTML).


// *************************************************  DETECTS INTERNET EXPLORER BROWSERS  ***************************************************
// SEARCH FOR IE KEY WORDS "compatible" and "MSIE" IN STRING AND MAKE SURE IT IS NOT OPERA IN DISGUISE...
var isIE = sUserAgent.indexOf("compatible") > -1 
           && sUserAgent.indexOf("MSIE") > -1
           && !isOpera;
           
var isMinIE4 = isMinIE5 = isMinIE5_5 = isMinIE6 = false;

if (isIE) {
    // IF IE THEN EXTRACT VERSION NUMBER...
	var reIE = new RegExp("MSIE (\\d+\\.\\d+);");
    reIE.test(sUserAgent);
    var fIEVersion = parseFloat(RegExp["$1"]);
	// SET MIN IE VERSION NUMBER...
    isMinIE4 = fIEVersion >= 4;
    isMinIE5 = fIEVersion >= 5;
    isMinIE5_5 = fIEVersion >= 5.5;
    isMinIE6 = fIEVersion >= 6.0;
	myBrowser = "IE " + fIEVersion;
}



// *************************************************  DETECTS MOZILLA BROWSERS  ***************************************************
// SEARCH FOR MOZILLA KEY WORD "Gecko" IN STRING AND MAKE SURE IT IS NOT KHTML/SAFARI/KKONQUEROR IN DISGUISE...
var isMoz = sUserAgent.indexOf("Gecko") > -1
            && !isKHTML;

var isMinMoz1 = sMinMoz1_4 = isMinMoz1_5 = false;

if (isMoz) {
    // IF MOZILLA THEN EXTRACT VERSION NUMBER...
	var reMoz = new RegExp("rv:(\\d+\\.\\d+(?:\\.\\d+)?)");
    reMoz.test(sUserAgent);
    // SET MIN MOZILLA VERSION NUMBER...
	isMinMoz1 = compareVersions(RegExp["$1"], "1.0") >= 0;
    isMinMoz1_4 = compareVersions(RegExp["$1"], "1.4") >= 0;
    isMinMoz1_5 = compareVersions(RegExp["$1"], "1.5") >= 0;
	myBrowser = "Mozilla " + RegExp["$1"];
}



// *************************************************  DETECTS NETSCAPE COMMUNICATOR 4.x BROWSERS  ***************************************************
// IF THE BROWSER IS NOT IE OR OPERA OR MOZILLA OR KHTML/SAFARI/KONQUEROR AND
// IF STRING STARTS WITH "Mozilla" AND appName IS "Netscape" AND 4.0<=appVersion<5.0 THEN IT MUST BE NETSCARE COMMUNICATOR 4.x ...
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) {
    // IF IT IS NETSCAPE COMMUNICATOR 4.x THEN SET MIN NETSCAPE VERSION NUMBER...
	isMinNS4 = true; // IF IT MADE IT THIS FAR THEN THIS IS AT LEAST TRUE!
    isMinNS4_5 = fAppVersion >= 4.5;
    isMinNS4_7 = fAppVersion >= 4.7;
    isMinNS4_8 = fAppVersion >= 4.8;
	myBrowser = "Netscape Communicator " + fAppVersion;
}



// ***************************************************************  DETECT THE OPERATING SYSTEM  ********************************************************************
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;

if (isWin) {
    isWin95 = sUserAgent.indexOf("Win95") > -1 
              || sUserAgent.indexOf("Windows 95") > -1;
    isWin98 = sUserAgent.indexOf("Win98") > -1 
              || sUserAgent.indexOf("Windows 98") > -1;
    isWinME = sUserAgent.indexOf("Win 9x 4.90") > -1 
              || sUserAgent.indexOf("Windows ME") > -1;
    isWin2K = sUserAgent.indexOf("Windows NT 5.0") > -1 
              || sUserAgent.indexOf("Windows 2000") > -1;
    isWinXP = sUserAgent.indexOf("Windows NT 5.1") > -1 
              || sUserAgent.indexOf("Windows XP") > -1;
    isWinNT4 = sUserAgent.indexOf("WinNT") > -1 
              || sUserAgent.indexOf("Windows NT") > -1 
              || sUserAgent.indexOf("WinNT4.0") > -1 
              || sUserAgent.indexOf("Windows NT 4.0") > -1 
              && (!isWinME && !isWin2K && !isWinXP);
	if(isWin95){myOS="Windows 95";} else if(isWin98){myOS="Windows 98";} else if(isWinME){myOS="Windows ME";} else if(isWin2K){myOS="Windows 2000";}
	else if(isWinXP){myOS="Windows XP";} else if(isWinNT4){myOS="Windows NT 4.0";}
} 

if (isMac) {
    isMac68K = sUserAgent.indexOf("Mac_68000") > -1 
               || sUserAgent.indexOf("68K") > -1;
    isMacPPC = sUserAgent.indexOf("Mac_PowerPC") > -1 
               || sUserAgent.indexOf("PPC") > -1;
	if(isMac68K) { myOS = "Mac 68K"; } else if(isMacPPC) { myOS = "Mac PowerPC"; }
}

if (isUnix) {
    isSunOS = sUserAgent.indexOf("SunOS") > -1;

    if (isSunOS) {
        var reSunOS = new RegExp("SunOS (\\d+\\.\\d+(?:\\.\\d+)?)");
        reSunOS.test(sUserAgent);
        isMinSunOS4 = compareVersions(RegExp["$1"], "4.0") >= 0;
        isMinSunOS5 = compareVersions(RegExp["$1"], "5.0") >= 0;
        isMinSunOS5_5 = compareVersions(RegExp["$1"], "5.5") >= 0;
		myOS = "SunOS " + RegExp["$1"];
    }
}