Minor drawing problem with Navigational Menu

1) Script Title: All Levels Navigational Menu (v3.02)

2) Script URL (on DD): http://www.dynamicdrive.com/dynamici...menu/index.htm

3) Describe problem: Attachment 4875

Try this procedure:

Open demo.html from attached zip file.
Highlight some item from Menu5. For example highlight Item52.
Now quickly move your mouse directly to Menu3. Menu3 is displayed but sometimes you can see that Menu5 remains visible as shown on image in the attached zip file.

The screenshot is from Opera 12.12 but in IE9 I can see the same. I have no idea where the problem is. It appears that it has something to do with Menu2 and it's submenus. Everything is fine when I remove Menu2 or at least Item2111.

Hope that description was clear enough.

Regards
Roman