Orbit/app/assets/javascripts/user_attribute_form.js

var new_one = $('fieldset #new_one').clone();
$('fieldset #new_one').remove();

$('fieldset a.remove').live( "click", function(){
	$(this).parent().remove();
});

$('fieldset a.add').click(function(){
	new_one.clone().appendTo( $('fieldset') );
})