var sUserAgent = navigator.userAgent;
var fAppVersion = parseFloat(navigator.appVersion);

function compareVersions(sVersion1, sVersion2) {
    var aVersion1 = sVersion1.split(".");
    var aVersion2 = sVersion2.split(".");

    if (aVersion1.length > aVersion2.length) {
        for (var i=0; i < aVersion1.length - aVersion2.length; i++) {
            aVersion2.push("0");
        }
    } else if (aVersion1.length < aVersion2.length) {
        for (var i=0; i < aVersion2.length - aVersion1.length; i++) {
            aVersion1.push("0");
        }
    }
    for (var i=0; i < aVersion1.length; i++) {
        if (aVersion1[i] < aVersion2[i]) {
            return -1;
        } else if (aVersion1[i] > aVersion2[i]) {
            return 1;
        }
    }
    return 0;
}



//Opera
var isOpera = sUserAgent.indexOf("Opera") > -1;


//KHTML, Konqueror
var isKHTML = sUserAgent.indexOf("KHTML") > -1 || sUserAgent.indexOf("Konqueror") > -1  || sUserAgent.indexOf("AppleWebKit") > -1;

var isSafari = false;

    isSafari = sUserAgent.indexOf("AppleWebKit") > -1;
    isKonq = sUserAgent.indexOf("Konqueror") > -1;

// Internet Explorer
var isIE = sUserAgent.indexOf("compatible") > -1 && sUserAgent.indexOf("MSIE") > -1 && !isOpera;

// Mozilla 여부
var isMoz = sUserAgent.indexOf("Gecko") > -1 && !isKHTML;


var isNS4 = !isIE && !isOpera && !isMoz && !isKHTML && (sUserAgent.indexOf("Mozilla") == 0) && (navigator.appName == "Netscape") && (fAppVersion >= 4.0 && fAppVersion < 5.0);


var isFF = !isIE && !isOpera && isMoz && !isKHTML && (sUserAgent.indexOf("Mozilla") == 0) && (navigator.appName == "Netscape");

//구글 크롬 버전체크 추가 2008.09.03
var isChrome = !isIE && !isFF && !isOpera && !isMoz && !isKonq && isSafari && isKHTML && (sUserAgent.indexOf("Mozilla") == 0) && (sUserAgent.indexOf("Chrome") != -1) && (navigator.appName == "Netscape");