How to toggle 2 fields in Forms 2.0

[Grégoire_Miche2]

Dear all,

I have 2 checkboxes in a form. I want that both cannot be checked together. So, when the 1st one is checked, I want that the second one to be unchecked immediately and vice-versa. (all this being visible to the visitor, not happening when the form is posted).

Any idea on how to do this ?

Thx in advance,

-Greg