var mobile_browsers = new Array('iPhone', 'iPod', 'BlackBerry', 'Android', 'Windows CE', 'LG', 'MOT', 'SAMSUNG', 'SonyEricsson', 'Opera Mobi', 'Mobile');

for (var word in mobile_browsers){
    if (navigator.userAgent.match(mobile_browsers[word]) != null){
        //location.href = "/m/";
        break;
    }
}