How do you enable customers use their openid on your website, just like stackoverflow?

Question

I want customers to use their openId on my site. I googled for this but didn't find any good tutorial. I use PHP and MySQL.

There is one at Plaxo. But it says we should download something from JanRain.com.

I saw the openId module of Drupal. It doesn't want anything to be downloaded.

Can anyone tell me what to do exactly?

Answer 1

Stack Overflow uses this library for the smoking hot javascript interface: http://code.google.com/p/openid-selector/

Answer 2

Many decent libraries are listed here: http://wiki.openid.net/Libraries