title: Generic spinner / processing message in a browser
body: <p>Most browsers show a spinner in the tab at the top of the page when a page is loading. It's a standard way of showing that the browser is in the process of fetching something.</p>
  
  <p>I'm writing a client-side ajax app, and would like a generic way of showing that an ajax call is in process. Rather than finding some element on the page and sticking a spinner on it, is there a generic way in javascript to access the browser's spinner?</p>