Pulldown Menu

Hi everybody!!

i've a question:

i want to do that:

in the cell A1 i want to put a pulldown menu with some voices (like "red", "blue" and "white" or "no color") - i know how to do that, but:
in the cell A2 i want to put a pulldown menu that has the same voices of the menu in A1 LESS the voice selected in A1 (so if in A1 the user chooses "red", the A2-menu has to show "blue" "white" or "no color" and so on). I want to make the same in A3 (the same menu less the voice in A1 and A2.

any idea?? i suppose this can be done with VBA, but i'm a beginner with it.

Look here for dependent data validation list:

http://www.contextures.com/xlDataVal02.html

perhaps like this