Any ideas how the "stickr" widget developed on www.stickr.com

www.stickr.com has these post-it kind of stickers which can be attached on any website, I wanted to know how are these widget developed? is it developed using JQuery any ideas?

but the main issue I dont want local storage .... I want that If I send this url to a friends he should be able to see the stickr notes o开发者_运维百科n that page

http://net.tutsplus.com/tutorials/html-css-techniques/building-persistant-sticky-notes-with-local-storage/

A cool way to do this