collapse

http://drupal.org/project/collapsiblock
requires: http://drupal.org/project/jstools

See also:

Collapsible Blocks with Cookies
http://keven.squad5.net/node/20

This Apache rule describes how to have all selected domains and subdomains for a site come up in the site visitor's browser address bar as your one chosen canonical domain.

Here is an all-in-one-line approach: