public void setPictureMimeType(String pictureMimeType)
   {
      if (pictureMimeType != null && !pictureMimeType.equals("") && !pictureMimeType.equals("image/") && !pictureMimeType.equals("image/jpg") && !pictureMimeType.equals("image/png"))
         throw new IllegalArgumentException("The picture mime type field in the " + frameType.getId() + " frame contains an invalid value, " + pictureMimeType + ".\n" +
                                            "It must be either \"\", \"image/\", \"image/jpg\", or \"image/png\".");

      this.dirty           = true;
      this.pictureMimeType = pictureMimeType == null || pictureMimeType.length() == 0 ? "image/" : pictureMimeType;
   }