通过javascript提交表单时，IE中的访问被拒绝错误

@using (Html.BeginForm("Upload", "MyProfile", FormMethod.Post, new
{
    @encType = "multipart/form-data",
    id = "ImgForm",
    name = "ImgForm",
    target = "UploadTarget"
}))
{   
    <input type="file" name="FileUpload" class="filestyle-notext fileupload">                
}

<iframe id="UploadTarget" name="UploadTarget" style="position: absolute; left: -999em; top: -999em;"></iframe>
@using (Html.BeginForm("Upload", "MyProfile", F