Alternate stylesheets

[Spider]

What is the best way to offer two or more stylesheets on a website and allow users to choose between them at runtime?
Ideally I'd like it changed client-side, but if it needs another trip to the server then sobeit.

Anyone suggest the best way? Ive seen a few sites offer this feature.

Cheers

 

[toString]

I believe this is the usual link that's posted:

http://alistapart.com/stories/alternate/