Fetch external content via Ajax for the 2nd and 3rd tabs by setting an
href for the tabs. While the Ajax request is waiting for a response, the
tab label changes to say "Loading...", then returns to the normal label
once loaded.

Fetch external content via Ajax for the tabs by setting an href value
in the tab links. While the Ajax request is waiting for a response, the
tab label changes to say "Loading...", then returns to the normal label
once loaded.