Are you using QV9 with onthefly AJAX-generation?
Then you want to modify the file C:\Programme\QlikView\Server\QvClients\QvAjaxZfc\opendoc.htm. It's the HTML-template of all AJAX-applications.
I have an example how to integrate a waiting cursor into a Qlikview AJAX-application.
The document describes which steps are needed to set this up. See chapter 3 how it works with QV9.
See chapter 2 how it works for pregenerated AJAX-pages in QV8.5
Maybe what you need is even simpler. You might can modify the opendoc.htm directly.