public static void main(String[] args) throws MalformedURLException, URISyntaxException {
            String pageBase = "http://www.some.com/one/../two/";
            URL base =  new URL(pageBase);
            URL img_src = new URL(base,"images/cool.jpg");
            System.out.println("base :" + base.toExternalForm());
            System.out.println("img_src :" + img_src.toExternalForm());

            // this is what happens in TEXTPANEElement.HTMLImageCache.get()
            System.out.println("Is img from base page :" + img_src.toExternalForm().startsWith(pageBase));

            URI baseUri = base.toURI();
            String pageBaseNormalized = baseUri.normalize().toString();
            System.out.println("base normalized:" + pageBaseNormalized);
            System.out.println("Is img from base page :" + img_src.toExternalForm().startsWith(pageBaseNormalized));

    }