app/assets/javascripts/refinery/contacts/admin/contacts.js
$(function() {
$('form.edit_contact, form.new_contact').on("click", ".remove_fields", function(e) {
$(this).prev('input[type=hidden]').val('1');
$(this).closest('div.field').hide();
e.preventDefault();
});
$('form.edit_contact, form.new_contact').on("click", ".add_fields", function(e) {
var time = new Date().getTime();
var regexp = new RegExp($(this).data('id'), 'g');
$(this).before($(this).data('fields').replace(regexp, time));
e.preventDefault();
});
});