public void actionPerformed(ActionEvent e)
			{
				new Thread()
				{
					public void run()
					{
						unseenVal = !unseenVal;
						for(int i=0; i<jt.getRowCount(); ++i)
							jt.setValueAt(unseenVal, i, jt.getColumn("Download").getModelIndex());
					}
				}.start();
			}