suckBrowserAjaxUpload: a very simple (fake) ajax upload plugin by using iframe
usage: $('YOUR_FORM_SELECTOR').suckBrowserAjaxUpload();
settings:
autoUpload - submit or not while file input changes
fileInput - you know
beforeSend - put some actions you'd like to do before submit
complete - put some actions you'd like to do after request has been completed, the first parameter is the returned content from your server, it will be parse to JSON format automatically or remain html when $.parseJSON failed.