howto load mvc in div from menu in other div

[eluser]Unknown[/eluser]
I have a mvc where one div contains a menu. From this menu I want to load another mvc in another div, sort of iframe in the past. Doing this with a complete screenrefresh is not difficult, but I do not want to refresh the menu and footer, only the div with the data.

How do I do this with CI.

I want to keep the mvc intact, that is, one mvc for everything on the screen and a mvc per datapage.