public void testMultiplePictures() throws Exception {
String cwd = System.getProperty("HSLF.testdata.path");
SlideShow ppt = new SlideShow();
Slide s = ppt.createSlide();
Slide s2 = ppt.createSlide();
Slide s3 = ppt.createSlide();
int idx = ppt.addPicture(new File(cwd, "clock.jpg"), Picture.JPEG);
Picture pict = new Picture(idx);
Picture pict2 = new Picture(idx);