Goal is to move the HTML and Templates to another file.
The loading of all content will be using jQuery's .load
The Top menu will be build from the server. And each click will dynamically load content from another requested file ( which will be index.php itself)
The dispatcher of index.php now has to provide the content of the page too ( although the content will itself will be saved in separate PHP file)

All the messages, content, and HTML template will be stored in that file only.