I have a specific single <A HREF="blah">...</A> link that is very slow to load the page (a large PDF is being generated on the server so it takes some time) and I want to display a "Loading..." progress panel in AJAX on the page that contains the link. But I cannot find any details on this in the help. Do I need to run a client-side script from that A HREF link so the progress panel pops up? Can you provide an example of how to do this?