Karol, I do not think this is a problem with AJAX''s javascript as it is with IE''s XHTTPRequest handler. If you go through the Javascript code you can see that an attempt is made to load one of three of these engines. Certain browsers have certain Xhttprequest handlers. So unless I am mistaken MS would have to update IE to use the :loading parameter. Anyone else with a bit more info able to jump in?