Remove Item from dropdown list - by: moriento

Hi all

We want to remove some items from an dropdown-list, if they are selceted in a question before.
How can we do that?

The questions are in the same guestion-group.

Exp:
Question 1: Select de job you're most interested in
Arrey: cook, chemist, florist, painter, carpenter, ...

Question 2: Select de job you're 2nd most interested in
Arrey: (same as question 1 without the selected answer from question 1)

I think, this should be done with javascipt but I'm not very familiar with it...
Thanks for your help!