Small update
I have updated the example listing with an example of menu with horizontal submenus. This was asked several times and I got time to do it last week while staying at home, recovering from the flu (or some similar thing).
During development, I accidentally found the problem in IE, with .htc. If you have some :hover rule which is empty, IE will throw “invalid pointer” error. I updated all .htc files to fix this - they are all now in .21 version.