This really confused me too, I could only see the "Try it" button and presumed it would give me a demo. I am not seeing it at all on the front page but do get this error:

Error: $("#haas").offset() is null Source File: http://www.helpbubble.com/ Line: 33

Edit: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.0.15) Gecko/2009102814 Iceweasel/3.0.6 (Debian-3.0.6-3)