1024*768        800*600               1024*768           800*600             1024*768            800*600            1024*768         800*600

             640*480                                        640*480                                          640*480                                         640*480

1024*768         800*600             1024*768           800*600             1024*768            800*600       1024*768           800*600

             640*480                                       640*480                                         640*480                                    640*480

1024*768           800*600             1024*768          800*600            1024*768            800*600

              640*480                                         640*480                                       640*480