Missing height calculation causes problems with elements below the menu

[Kopyov]

All child levels have absolute positioning, which means the height of the menu container always remains the same and equals first UL height. So if i have some extra elements below the menu, they appear on top of the menu, since the height doesn't change if i go deeper in levels. Solution would be re-calculating wrapper height that equals visible UL height on anchor click. Would be very nice to get this quick addition for such a great component.