function getOS() {

    var os=new Array("unknown", "unknown");
    var brs=navigator.userAgent.toLowerCase();
    if (brs.search(/windows\sce/) != -1) {
        os[0]="wince";
        try {
            os[1]=brs.match(/windows\sce\/(\d+(\.?\d)*)/)[1];
        } catch (e) { }
        return os;
    } else if ( (brs.search(/windows/) !=-1) || ((brs.search(/win9\d{1}/) !=-1))) {
        os[0]="win";
        if (brs.search(/nt\s5\.1/) != -1) {
            os[1]="xp";
        } else if (brs.search(/nt\s5\.0/) != -1) {
            os[1]="2000";
        } else if ( (brs.search(/win98/) != -1) || (brs.search(/windows\s98/)!=-1 ) ) {
            os[1]="98";
        } else if (brs.search(/windows\sme/) != -1) {
            os[1]="me";
        } else if (brs.search(/nt\s5\.2/) != -1) {
            os[1]="win2k3";
        } else if ( (brs.search(/windows\s95/) != -1) || (brs.search(/win95/)!=-1 ) ) {
            os[1]="95";
        } else if ( (brs.search(/nt\s4\.0/) != -1) || (brs.search(/nt4\.0/) ) !=-1) {
            os[1]="nt4";
        }

        return os;
    } else if (brs.search(/linux/) !=-1) {
        os[0]="linux";
        try {
            os[1] = brs.match(/linux\s?(\d+(\.?\d)*)/)[1];
        } catch (e) { }
        return os;
    } else if (brs.search(/mac\sos\sx/) !=-1) {
        os[0]="macosx";
        return os;
    } else if (brs.search(/freebsd/) !=-1) {
        os[0]="freebsd";
        try {
            os[1] = brs.match(/freebsd\s(\d(\.\d)*)*/)[1];
        } catch (e) { }
        return os;
    } else if (brs.search(/sunos/) !=-1) {
        os[0]="sunos";
        try {
            os[1]=brs.match(/sunos\s(\d(\.\d)*)*/)[1];
        } catch (e) { }
        return os;
    } else if (brs.search(/irix/) !=-1) {
        os[0]="irix";
        try {
            os[1]=brs.match(/irix\s(\d(\.\d)*)*/)[1];
        } catch (e) { }
        return os;
    } else if (brs.search(/openbsd/) !=-1) {
        os[0]="openbsd";
        try {
            os[1] = brs.match(/openbsd\s(\d(\.\d)*)*/)[1];
        } catch (e) { }
        return os;
    } else if ( (brs.search(/macintosh/) !=-1) || (brs.search(/mac\x5fpowerpc/)!= -1) ) {
        os[0]="macclassic";
        return os;
    } else if (brs.search(/os\/2/) !=-1) {
        os[0]="os2";
        try {
            os[1]=brs.match(/warp\s((\d(\.\d)*)*)/)[1];
        } catch (e) { }
        return os;
    } else if (brs.search(/openvms/) !=-1) {
        os[0]="openvms";
        try {
            os[1]=brs.match(/openvms\sv((\d(\.\d)*)*)/)[1];
        } catch (e)  { }
        return os;
    } else if ( (brs.search(/amigaos/) !=-1) || (brs.search(/amiga/) != -1) ) {
        os[0]="amigaos";
        try {
            os[1]=brs.match(/amigaos\s?(\d(\.\d)*)*/)[1];
        } catch (e) { }
        return os;
    } else if (brs.search(/hurd/) !=-1) {
        os[0]="hurd";
        return os;
    } else if (brs.search(/hp\-ux/) != -1) {
        os[0]="hpux";
        try {
            os[1]=brs.match(/hp\-ux\sb\.[\/\s]?(\d+([\._]\d)*)/)[1];
        } catch (e) { }
        return os;
    } else if ( (brs.search(/unix/) !=-1) || (brs.search(/x11/) != -1 ) ) {
        os[0]="unix";
        return os;
    } else if (brs.search(/cygwin/) !=-1) {
        os[0]="cygwin";
        return os;
    } else if (brs.search(/java[\/\s]?(\d+([\._]\d)*)/) != -1) {
        os[0]="java";
        try {
            os[1]=brs.match(/java[\/\s]?(\d+([\._]\d)*)/)[1];
        } catch (e) { }
        return os;
    } else if (brs.search(/palmos/) != -1) {
        os[0]="palmos";
        return os;
    } else if (brs.search(/symbian\s?os\/(\d+([\._]\d)*)/) != -1) {
        os[0]="symbian";
        try {
            os[1]=brs.match(/symbian\s?os\/(\d+([\._]\d)*)/)[1];
        } catch (e) { }
        return os;
    } else {
        os[0]="unknown";
        return os;
    }
}