Users to add more form fields in FormBuilder

[climberusa]

Is there any way for a user to add more form fields and have them auto increment the input id and name. What I want is something like Dustin Diaz did here:

http://www.dustindiaz.com/add-and-remove-html-elements-dynamically-with-javascript/

If that's not possible is there any way to group a few related input fields and then in the template place a link that I can toggle with javascript?

Thanks,

Jeff