Expandable/collapsable buttons, like googlegroups has?

[boytheo]

LiveJournal and googlegroups both have this neat feature of being able to collapse or expand parts of the page, without needing to reload the page.

How is this done? Is there a tutorial somewhere?

[BlobFisk]

Javascript and manipulation of the DOM. To emulate the Google functionality you can go this by playing with the margins on floated layers.

HTH