detect mobile device using javascript

detect.js

var isMobile = {
    Android: function() {
        return navigator.userAgent.match(/Android/i);
    },
    BlackBerry: function() {
        return navigator.userAgent.match(/BlackBerry/i);
    },
    iOS: function() {
        return navigator.userAgent.match(/iPhone|iPad|iPod/i);
    },
    Opera: function() {
        return navigator.userAgent.match(/Opera Mini/i);
    },
    Windows: function() {
        return navigator.userAgent.match(/IEMobile/i);
    },
    any: function() {
        return (isMobile.Android() || isMobile.BlackBerry() || isMobile.iOS() || isMobile.Opera() || isMobile.Windows());
    },
    none: function() {
        return (!isMobile.any());
    }
};

<script type="text/javascript">
    if (isMobile.any()){
        document.write('Mobile');
        if (isMobile.iOS()){
            document.write('/iOS');
        } else if (isMobile.Android()){
            document.write('/Android');
        } else if (isMobile.BlackBerry()){
            document.write('/BlackBerry');
        } else if (isMobile.Windows()){
            document.write('/Windows');
        } else {
            document.write('/other');
        }
    } else if (isMobile.none()) {
        document.write('non-mobile');
    } else {
        document.write('unknown');
    }
</script>

minified (512 bytes):
var isMobile={Android:function(){return navigator.userAgent.match(/Android/i)},BlackBerry:function(){return navigator.userAgent.match(/BlackBerry/i)},iOS:function(){return navigator.userAgent.match(/iPhone|iPad|iPod/i)},Opera:function(){return navigator.userAgent.match(/Opera Mini/i)},Windows:function(){return navigator.userAgent.match(/IEMobile/i)},any:function(){return isMobile.Android()||isMobile.BlackBerry()||isMobile.iOS()||isMobile.Opera()||isMobile.Windows()},none:function(){return!isMobile.any()}};