Hi Alberto,
The busy.gif is an image on the page that is unhidden when _asyncronous_ calls occur. Since you have not yet generated the page, and sent it to the browser, you can't do anything with it, since it does not exist....
The best you can do is send an (unhidden) one to the browser before you start filling your browse, and then add javascript to the page to hide it as soon as the page appears.
Cheers
Bruce