limit checkbox to two?

[kingokrauts]

I am attempting to create a form that will have several checkboxes, but I want people to be able to only select two.  Or, if I can use radio buttons that would be fine also, as long as two can be selected at once in the same group.  How do I do this?

[Former Community Member · Accepted solution]

John Brinkmann has written 3 spearate blogs on exclusion groups and shows how to do this. Here is the 3rd entry, it has links the the other two inside.

http://blogs.adobe.com/formfeed/2008/10/exclusion_groups_v30.html