BetterPHP

How can load only div from file..

I saw on alex's tutorial about shout box, and there is whole page loaded. But how can i load only div from some page?

Example: i have the file called shout.php and into that have many divs, and i want load only div where is shouts. Is that possible?

How about loading 'shout.php?part=1' then in the shout.php checking if $_GET['part'] == 1 and if it does then just echo out the div or something similar.