sS hjs_imgUploadBase64Encoder() {

  ret hscript([[

    var imgConverted = false;

    function submitWithImageConversion(form) {

      console.log("imgConverted: " + imgConverted + ", form: " + form);

      if (imgConverted) return true;

      imgConverted = true;

      var file = $('#imgUploader')[0].files[0];

      if (file == null) return true;

      var reader = new FileReader();

      // delay form submit until reader is done

      reader.onloadend = function () {

        var b64 = reader.result.replace(/^data:.+;base64,/, '');

        $("#f_img_base64").val(b64);

        console.log("Got base64 data: " + b64.length);

        setTimeout(function() {

          $(form).submit();

        }, 1000);

      };

      reader.readAsDataURL(file);

      return false;

    }

  ]]);

}