var useragents = [
        'palm', 'palmos', 'palmsource', 'iphone', 'blackberry', 'nokia', 'phone', 'midp', 'mobi', 'pda', 'wap', 'java', 'nokia', 'hand', 'symbian', 'chtml', 
        'wml', 'ericsson', 'lg', 'audiovox', 'motorola', 'samsung', 'sanyo', 'sharp', 'telit', 'tsm', 'mobile', 'mini', 'windows ce', 'smartphone', '240x320', 
        '320x320', 'mobileexplorer', 'j2me', 'sgh', 'portable', 'sprint', 'vodafone', 'docomo', 'kddi', 'softbank', 'pdxgw', 'j-phone', 'astel', 'minimo', 
        'plucker', 'netfront', 'xiino', 'mot-v', 'mot-e', 'portalmmm', 'sagem', 'sie-s', 'sie-m', 'android', 'ipod'
    ];

    var agt = navigator.userAgent.toLowerCase();
    var is_mobile = false;

    for ( i = 0; i < useragents.length; i++ ) {
        if ( agt.indexOf( useragents[i] ) != -1 ) {
            is_mobile = true;
            user_agent = agt;
            break;
        }
    }