Dynamic Allowed value in a select list field

Hello,

I'm using Drupal 5.7 and the CCK module.
I would like to manage a dynamic allowed value list field.

Exemple :

1st select list field : "1,2,3"

2nd select list field :
Instead of having "10,11,12,13,14,15,21,22,23,24,25,31,32,33,34,35"
I would like to have only "10,11,12,13,14,15" if the user selected "1" in the first field, same thing for 2 and 3.

Is there any easy way to do that ?
Thanks for your help.

Matthieu.