$('#button').click(function () {
    (new BigFileUploader($('#file').get(0), {
        url: './upload.php',
        error: function (o) {
            alert(o.message);
        },
        success: function (o) {
            alert(o.message);
        },
        progress: function (o) {
            console.log(o.percent);
            $('#progressBar').css('width', o.percent + '%');
        }
    })).start();
})