ajax fileupload for IE

<!--[if !IE]><!-->
<form action="/upload" method="post" enctype="multipart/form-data">
<div class="fileinput fileinput-new" data-provides="fileinput">
  <div class="input-group">
    <div class="form-control uneditable-input span3" data-trigger="fileinput"><i class="glyphicon glyphicon-file fileinput-exists"></i> <span class="fileinput-filename">{% if form.value!='' %}{{form.value}}{% endif %}</span></div>
    <span class="input-group-addon btn btn-default btn-file"><span class="fileinput-new">ファイルを選択</span><span class="fileinput-exists">変更</span><input type="file" name="{{form.name}}" onchange="fileupload(event);"></span>
    <a href="#" class="input-group-addon btn btn-default fileinput-exists" data-dismiss="fileinput">選択解除</a>
  </div>
</div>
</form>
<![endif]-->
<!--[if IE]>
<form action="/upload" method="post" enctype="multipart/form-data">
<input type="file" name="{{form.name}}" onchange="fileupload(event);"></span>
</form>
<![endif]-->

<script type="text/javascript" charset="utf-8">
fileupload = function(event) {
  var $form, target;
  target = event.target ? event.target : event.srcElement;
  $form = $(target).closest('form');
  $form.append(csrf_token);
  return $form.ajaxSubmit({
    'success': function(filename) {
      alert("アップロードしました");
    }
  });
};
</script>