CSS vertical menu - how do i get *some* child items to align to right edge of parent??

[eluser]spheroid[/eluser]
I have a purely css menu that drops down child menus vertically. The parent menu is aligned to the right of the page. The child menus that drop down are left-aligned with their parent menu. Is there a way to easily adjust some menus (like the rightmost ones) to have their child menus align with the right of their parent?

Example:

Code:

MENU 1         MENU 2        MENU 3            MENU 4
MEN1 ITEM 1    MEN2 ITEM 1   MEN3 ITEM 1  MEN4 ITEM 1
MEN1 ITEM 2    MEN2 ITEM 2                MEN4 ITEM 2

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