Rails - Mar 2008 - Way to get the form name/id from a form_for (default) builder?

Hi all,

I''d like to be able to refer to a form being created by form_for from
javascript. To do this, I''d like to know what will be the id and/or
name that''s going to be set on the form. I understand I can override
the id or name, but i''d prefer not to.

For instance, I''m looking for something to fill in
someMethodToGiveMeInputNameFor:

<% form_for :role, ... %>
  <button type="button"
onClick="doSomething(document.getElementById(''<
%= form.someMethodToGiveMeInputNameFor(:rights) %>'')">Press
Me</
button>
   <%= form.select(:rights, ... %>
<% end %>

Thanks in advance!
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