How have they created this click, drag and capture feature

Hi There,

Happy New Year to all Kirupa users!!

I would love to know how to create the click, drag and capture method used on this online brochure.

http://dennis.cerosmedia.com/394caf73404b138310ad92f368427fb9198.cde

You simply click your mouse drag, until you have the portion of the page you want and then release. You can then send it to a friend or save it in a clippings area.

Has anyone any ideas, as I would love to use it in a project.

Please excuse the content of the brochure, but its the only one I could find with this technology on it!!

Cheers