From Facebook Developers Wiki

[edit] Description

The fb:dialog-content tag is a child of fb:dialog and represents the content that gets displayed inside the popup dialog when it appears.

This section can be styled like any other part of your app.

[edit] Examples

<fb:dialog id="my_dialog"> <fb:dialog-title>My Little Dialog</fb:dialog-title> <fb:dialog-content><form id="my_form">Do you like my little dialog?</form></fb:dialog-content> <fb:dialog-button type="submit" value="Yes" clickrewriteurl="http://www.some_url_here.com/dialog_return.php" clickrewriteid="my_dialog" clickrewriteform="my_form" /> </fb:dialog>