gistfile1.txt

    $j('#something').html('fetching');
    $j.ajax({
        url: '/path/to/epub.epub',
        complete: function(response, status, request) {
            var the_zip = new JSUnzip(response.responseText);
            $j('#something').html('finished with ' + status);

            console.log("is it zip?" + the_zip.isZipFile());
            var epub = new JSEpub(response.responseText);

            epub.processInSteps(function (step, extras) {
                var msg = '';
                console.log(step);
                if (step === 1) {
                    msg = "Unzipping";
                } else if (step === 2) {
                    msg = "Uncompressing " + extras;
                } else if (step === 3) {
                    msg = "Reading OPF";
                } else if (step === 4) {
                    msg = "Post processing";
                } else if (step === 5) {
                    msg = "Finishing";
                    alert('done!');
                } else {
                    msg = "Error!";
                }

                $j('#something').html(msg);
            });

        }
    });