Hi Werner,
On Jul 13, 2011, at 4:22 PM, Werner Greßhoff wrote:
  Hello,
 customization of skins is a very fine solution for changing page
 structures, cause it survives updates. In pre XWiki 3.1 we edited
 the global.vm of the colibri skin and our header was shown on all
 pages, including the login. In XWiki 3.1 there is no global.vm
 (in colibri) anymore 
Are you sure about this? I've checked the code and I can see a global.vml. I've
also logged out of my wiki and I can see the global header being displayed.
Thanks
-Vincent
  and the skin customizing doesn't work on the
 login page, so how can we change that page, too?
 --
 Mit freundlichen Grüßen
 Werner Greßhoff