pulling in some of the changes from deep branch

app/helpers/application_helper.rb

@@ -1,19 +1,19 @@
 # Methods added to this helper will be available to all templates in the application.
 module ApplicationHelper
-  def remove_task_link(name, f)
+  def remove_child_link(name, f)
     f.hidden_field(:_delete) + link_to_function(name, "remove_fields(this)")
   end
 
-  def add_task_link(name, f)
-    fields = new_child_fields(f, :tasks)
-    link_to_function(name, "insert_fields('tasks', '#{escape_javascript(fields)}')")
+  def add_child_link(name, f, method)
+    fields = new_child_fields(f, method)
+    link_to_function(name, h("insert_fields(this, \"#{method}\", \"#{escape_javascript(fields)}\")"))
   end
 
   def new_child_fields(form_builder, method, options = {})
     options[:object] ||= form_builder.object.class.reflect_on_association(method).klass.new
     options[:partial] ||= method.to_s.singularize
     options[:form_builder_local] ||= :f
-    form_builder.fields_for(method, options[:object], :child_index => 'NEW_RECORD') do |f|
+    form_builder.fields_for(method, options[:object], :child_index => "new_#{method}") do |f|
       render(:partial => options[:partial], :locals => { options[:form_builder_local] => f })
     end
   end

app/views/projects/_form.html.erb

@@ -6,11 +6,9 @@
   </p>
 
   <h3>Tasks</h3>
-  <div id="tasks">
   <% f.fields_for :tasks do |task_form| %>
     <%= render :partial => 'task', :locals => { :f => task_form } %>
   <% end %>
-  </div>
-  <p><%= add_task_link "New Task", f %></p>
+  <p><%= add_child_link "New Task", f, :tasks %></p>
   <p><%= f.submit "Submit" %></p>
 <% end %>

app/views/projects/_task.html.erb

@@ -1,7 +1,7 @@
 <div class="field">
   <%= f.label :name, "Task" %>
   <%= f.text_field :name %>
-  <%= remove_task_link "remove", f %>
+  <%= remove_child_link "remove", f %>
   <%# Alternatively you can use a check box: %>
   <%# f.check_box :_delete %>
   <%# f.label :_delete, "(remove)" %>

public/javascripts/application.js

@@ -1,9 +1,10 @@
 // Place your application-specific JavaScript functions and classes here
 // This file is automatically included by javascript_include_tag :defaults
-function insert_fields(element_id, content) {
+function insert_fields(link, method, content) {
   var new_id = new Date().getTime();
-  $(element_id).insert({
-    bottom: content.replace(/NEW_RECORD/g, new_id)
+  var regexp = new RegExp("new_" + method, "g")
+  $(link).up().insert({
+    before: content.replace(regexp, new_id)
   });
 }
 
@@ -12,5 +13,5 @@ function remove_fields(link) {
   if (hidden_field) {
     hidden_field.value = '1';
   }
-  $(link).up(".field").remove();
+  $(link).up(".field").hide();
 }