How to get Alexa site verification for your website ...??

I found interesting when searching for the process of Alexa Verification for my website from the forum (below link)

http://creators.ning.com/forum/topics/verify-your-site-alexa

But still, I wish to do this for Google sites hosted web site. I could not find any clues on this how to add the verify code to google sites. so research still going on

If any one know about this let me know...