Change div from another php

[casconi]

I there, a few weeks ago i started working on web design and already got some doubts (probably they are easy :P)

Here it goes,

I have a file "index.php" and inside there are 3 'div', when logged in i changed 'div1' and insert there the "my.php". But here's the problem, when i make an action inside "my.php", i want to change de content of 'div2' from "index.php" with "another.php".

Someone could give me some examples or directions on how to solve the problem.

Thanks