How to do javascript css style changes?

[munna]

Hi,
I would like to give visitors to my page the option of choosing from a number of different stylesheets. I remember seeing a javascript to do this ages ago, but can't find it now. Please can anyone tell me how to do this, or send me a link for a suitable code snippet?
Thanks,
Munna

[pyro]

Take a look at http://www.alistapart.com/issues/126/ though I personally used PHP to keep it working for those without javascript when I did it...