Due to popular request (hi xeon :), I have updated the examples with the drop-up version. This is useful if you want to place the menus in the page footer.
This is the only important part:
/* fix the position */ #menu li ul { bottom: 1.5em; left: 0; } #menu li li ul { bottom: 0; left: 100%; }
1.5em is just an example value. You need to modify it according to menu make-up (as shown in the examples).