TaskSeries s1 = new TaskSeries("Series");
    	s1.add(new Task("Task 1", new Date(0L), new Date(1L)));
    	TaskSeriesCollection u1 = new TaskSeriesCollection();
    	u1.add(s1);
    	SlidingGanttCategoryDataset d1 = new SlidingGanttCategoryDataset(
    			u1, 0, 5);
    	SlidingGanttCategoryDataset d2 = null;