Default Expandable (zero configuration)

Notes

This plugin is intended to be used with jQuery UI 1.6rc4+. It can currently also be used without jQuery UI, you just have to style the widget yourself; see example 4 ("Expandable with extra CSS").
If the expandable does not look or behave as expected double-check if the scripts and style sheets are really being loaded. You can use Firebug for that.
You have to set your own padding on the content via CSS.
If the content of the unfinished expandable is visible on page load (maybe your scripts are doing a lot of work) you can put a display:none on the expandable. It will appear once it's finished.
Some of your questions may be answered when you look at the code of this page. (eg. title, options, callbacks)