function selectOs( osDiv ) {
    osString = navigator.oscpu + navigator.userAgent;
    osString = osString.toLowerCase();

    var detectedOs = 'other';

    if (matches(osString, ['Windows NT 5.1', 'Windows XP'])) {
        detectedOs = 'xp';
    } else if (matches(osString, ['Windows NT 6.0', 'Windows Vista'])) {
        detectedOs = 'vista'
    } else if(matches(osString, ['Windows 7', 'Windows NT 6.1'])) {
        detectedOs = 'win7';
    } else if (matches(osString, ['Windows NT 6.2', 'Windows NT 6.3'])) {
        detectedOs = 'win8';
    } else if (matches(osString, ['Windows NT 6.4', 'Windows NT 10'])) {
        detectedOs = 'win10';
    } else if (matches(osString, ['android'])) {
        detectedOs = 'android';
    } else if (matches(osString, ['linux'])) {
        detectedOs = 'linux';
    } else if (matches(osString, ['mac os x', 'macintosh', 'mac_powerpc'])) {
        detectedOs = 'mac';
    } else {
        detectedOs = 'other';
    }

    $('#' + detectedOs).addClass('detectedOs');
    $('' + osDiv).load('os/' + detectedOs + '/howto.html');
    $('#osSelector').val(detectedOs);
    $('#osSelector').change(function () {
        $('' + osDiv).load('os/' + $(this).val() + '/howto.html');
    })
}

function matches(osString, strings) {
    for (var i=0; i<strings.length; i = i+1) {
        if (osString.indexOf(strings[i].toLowerCase()) > -1)
            return true;
    }
    return false;
}

/*
'Windows 3.11' => 'Win16',
'Windows 95' => '(Windows 95)|(Win95)|(Windows_95)',
'Windows 98' => '(Windows 98)|(Win98)',
'Windows 2000' => '(Windows NT 5.0)|(Windows 2000)',
'Windows XP' => '(Windows NT 5.1)|(Windows XP)',
'Windows Server 2003' => '(Windows NT 5.2)',
'Windows Vista' => '(Windows NT 6.0)',
'Windows 7' => '(Windows NT 6.1)',
'Windows 8' => '(Windows NT 6.2)|(WOW64)|(Windows NT 6.3)',
'Windows 10' => '(Windows NT 6.4)|(Windows NT 10)'
'Windows NT 4.0' => '(Windows NT 4.0)|(WinNT4.0)|(WinNT)|(Windows NT)',
'Windows ME' => 'Windows ME',
'Open BSD' => 'OpenBSD',
'Sun OS' => 'SunOS',
'Linux' => '(Linux)|(X11)',
'Mac OS' => '(Mac_PowerPC)|(Macintosh)|(Mac)',
'QNX' => 'QNX',
'BeOS' => 'BeOS',
'OS/2' => 'OS/2',
'Search Bot'=>'(nuhk)|(Googlebot)|(Yammybot)|(Openbot)|(Slurp)|(MSNBot)|(Ask Jeeves/Teoma)|(ia_archiver)'
*/