//　Macintosh           　->  MacOS
//　Windows95/98/NT/2000/XP  ->　Windows
//　UNIX                  ->　UNIX
function getOSType() {
    var uAgent = navigator.userAgent.toUpperCase();
    if (uAgent.indexOf("MAC") >= 0) return "MacOS";
    if (uAgent.indexOf("WIN") >= 0) return "Windows";
    if (uAgent.indexOf("X11") >= 0) return "UNIX";
    return "";
}
//　Firefox ->  Firefox
//　Netscape Navigator ->  Netscape
//　Internet Explorer  ->　Explorer
//　Safari  ->　Safari
//　Opera  ->　Opera
function getBrowserName() {
    var aName = navigator.appName.toUpperCase();
    var uName = navigator.userAgent.toUpperCase();
    if (uName.indexOf("SAFARI") >= 0) return "Safari";
    if (uName.indexOf("OPERA") >= 0) return "Opera";
    if (uName.indexOf("FIREFOX") >= 0) return "Firefox";
    if (aName.indexOf("NETSCAPE") >= 0) return "Netscape";
    if (aName.indexOf("MICROSOFT") >= 0) return "Explorer";
    return "";
}
function getBrowserVersion() {
    var browser = getBrowserName();
    var version = 0;
    var s = 0;
    var e = 0;
    var appVer = navigator.appVersion;
    var uName = navigator.userAgent.toUpperCase();
    if (browser == "Safari") {
        s = uName.indexOf("SAFARI/", 0);
        version = (uName.substring(s + 7, s + 99));
        if (version < 400) version = 1;
        if ((version >= 400) < (version <= 499)) version = 2;
        if (version >= 500) version = 3;
    }
    if (browser == "Opera") {
        s = uName.indexOf("OPERA", 0) + 6;
        e = uName.indexOf(" ", s);
        version = parseFloat(uName.substring(s, e));
    }
    if (browser == "Firefox") {
        s = uName.indexOf("FIREFOX/", 0);
        version = parseFloat(uName.substring(s + 8, s + 8 + 3));
    }
    if (browser == "Netscape") {
        s = appVer.indexOf(" ", 0);
        version = eval(appVer.substring(0, s));
        if (version >= 5) version++;
    }
    if (browser == "Explorer") {
        appVer = navigator.userAgent;
        s = appVer.indexOf("MSIE ", 0) + 5;
        e = appVer.indexOf(";", s);
        version = eval(appVer.substring(s, e));
    }
    return version;
}
function writeCssTag() {
    os = getOSType();
    browser = getBrowserName();
    version = getBrowserVersion();
    dirName = "css/top/";
    if ((version >= 6) && (version < 7)) {
        dirName += "importie6.css";
    } else {
        dirName += "import.css";
    }
    //        if (os == "MacOS") dirName = "mac/";
    //        if (os == "Windows") dirName = "win/";
    //        if (os == "UNIX") dirName = "unix/";
    //        if (browser == "Firefox") dirName += "ff";
    //        if (browser == "Netscape") dirName += "nn";
    //        if (browser == "Explorer") dirName += "ie";
    //        if (browser == "Safari") dirName += "saf";
    //        if (browser == "Opera") dirName += "op";
    //        if ((version >= 1) && (version < 2)) dirName += "1.css";
    //        if ((version >= 2) && (version < 3)) dirName += "2.css";
    //        if ((version >= 3) && (version < 4)) dirName += "3.css";
    //        if ((version >= 4) && (version < 5)) dirName += "4.css";
    //        if ((version >= 5) && (version < 5.5)) dirName += "5.css";
    //        if ((version >= 5.5) && (version < 6)) dirName += "5.5.css";
    //        if ((version >= 6) && (version < 7)) dirName += "6.css";
    //        if ((version >= 7) && (version < 8)) dirName += "7.css";
    //        if ((version >= 8) && (version < 8.5)) dirName += "8.css";
    //        if ((version >= 8.5) && (version < 9)) dirName += "8.5.css";
    document.write('<link rel=\"stylesheet\" href=\"' + dirName + '\" type=\"text/css\">');
    //    alert(dirName);
}