"url(" + img.getURL().toString() + ")");
"url(" + icon.getURL().toString() + ")");
    public void setBackgroundImage(SIcon img) {        backgroundImage = img;        if (img == null) {            removeAttribute(StyleConstants.BACKGROUND_IMAGE);        }        else {            setAttribute(StyleConstants.BACKGROUND_IMAGE,                          "url(" + img.getURL().toString() + ")");        }    }