Sys.WebForms.PageRequestManager.getInstance().add_endRequest(CheckSuccessNewsletter);
  function CheckSuccessNewsletter(sender, args)
  {
  	//header
    if(IsPostBackElement('submitNL'))
    {
      var success = $get('SuccessNewsletter');
      if(success)
      {
        ShowModalPopup('NewsletterModalPopup');
        return;
      }
      var failed = $get('FailedNewsletter');
      if (failed && failed.value=="_error")
      {
        OpenErrorMessage('请输入有效的电子邮件地址');
        return;
      }
    }
	//footer
    if(IsPostBackElement('submitNLfooter'))
    {
      var success = $get('SuccessNewsletterfooter');
      if(success)
      {
        ShowModalPopup('NewsletterModalPopup');
        return;
      }
      var failed = $get('FailedNewsletterfooter');
      if (failed && failed.value=="_error")
      {
        OpenErrorMessage('请输入有效的电子邮件地址');
        return;
      }
    }	
  }