Your code looks pretty cool, thanks for sharing Michal. After checking out these menus in IE I've come to the conclusion that as much as I'd like to have drop down menus with each element individually animating I don't know if that's going to have the capability to move as fast as I'd like for large menus. For menus with 3-6 items it might be ok but for 10 or 15 especially in IE it's slow. Unless the elements didn't wait for each other to finish I don't know if this type of menu animation could work fast enough to be smooth.
I have to work on some other parts of the site for the time being but I'll get back to the menus in a couple weeks and I'll definitively check out your code more closely and rework mine and see if I can get a solid solution together. Once I've done this I'll post with my results. bd
