Ajax Todo List system with Codeigniter Part 1

I am going to write how to create an ajax message/todo system with Codeigniter. All the following features will be done with Ajax. And the message will be stored in a database.
1. There will be Todo list and Completed list loaded with jquery.
2. Adding a todo list without page reload.
3. Clicking a link in a todo list will change to a completed list.
4. The list clicked will slide up and removed. The completed list will fade out and fade in with a new list added from todo list