Hi CGW
The way it is at the moment, you would need a give the Level-1 menu a left position of 202px to prevent mousing over a gap and losing the level-1 items.
ul#cssmw ul.level-1 {
left: 202px;
}
This is so that the level-1 items sit immediately adjacent to the level-0 menu with no gaps between.
There are chunks of css that are remarked out, so if you change those again you may have to adjust the positioning again.