-Disable scrollbars (not sure how how to do this).
-May need to override default menu navigation actions because dvdauthor
-seems to cause rather undesirable behaviour when buttons are not
-arranged in a grid.
-Search whole of history rather than just previous page when deciding whether a link goes back or forward.
+Support more than 99 videos by grouping them into titlesets.
+Avoid exceeding the maximum 128 instructions per PGC.
+Allow explicit ordering of videos.
+May need to override default menu navigation actions because dvdauthor seems to cause rather undesirable behaviour when buttons are not arranged in a grid.