$("#upload_file").change(function(){
    var filelist = $(this).context.files;
    for( var i = 0; i < filelist.length; ++i ) {      
      var fd = new FormData();
      fd.append('photo', filelist[i]);
      var form = $("<form method='POST' action='url.text' enctype='multipart/form-data'></form>");
      create_ajax_form(form, fd);
    }
}
function create_ajax_form(obj, fd){
  obj.ajaxForm({
      data: { data: fd },
      beforeSend: function(e) {},
      uploadProgress: function(event, position, total, percentComplete) {},
      complete: function(data) {}
  });
}