Additional Settings For Custom Profile Fields [1.2]

[Gstone]

i was reading the earlier post about selecting a custom field, then a new one appearing to be filled out after choosing an option. this is similar to what i want, but not quite.

What i would like to do is have a user select an option out of 4 (select box):

option a
option b
option c
option d

after choosing any of the options, the options in the second custom field are changed:

"option a" was chosen, and user can now select "hello" and "goodbye" in a new select box.
"option b" was chosen, and user can now select "yes" and "no"
and so on

i dont need the new custom field to open upon a selection though. it can simply be under the first select box, but the options within it change based on the first selection. or even, all options show, but some are disabled (greyed out, not selectable) based upon which selection was chosen first.

i suppose this will require javascript as well anyway? any direction for this would be nice, as i am not experience in javascript at all.