If you turn on script debugging in IE you do get popup error saying:
Error: 'Qva' is undefined
When you install QVS this should be set up automatically but it's possible that they are pointing to a different website on your server or, as the previous posted suggests, QVS isn't installed at all.
This also will not work if you do not have qlikview server running on the machine. If you are generating the ajax page based off the personal/developer version it will not run as it should without server.