Rails - Jun 2005 - Ajax Oberver for Radio Buttons

I can''t seem to get an Ajax observer to distinguish between a set of
radio buttons.

For example, I have two radio buttons created wtih the
radio_button_tag function like so:

<%=radio_button_tag "test", "1" %>
<%=radio_button_tag "test", "2" %>

When I try and observe the value ''test'', I am only getting
results
back for the first radio button.

I need to know which button is checked in order to perform the proper action.

Can anyone shed some light?

Thanks,

Michael