title: Give focus to browser
body: <p>I'm working on keyboard accessibility. I have a flash object which sits inside a page, and to stop the focus getting trapped inside it, I've added tab listeners which talk through <code>ExternalInterface</code> to some JavaScript functions.</p>
  
  <p>The JavaScript looks for the next available element with a <code>tabIndex</code> and calls <code>focus()</code> on it. So far so good. But if the plugin is the last tabbable item on the page (or first when reverse-tabbing), there is no element to switch to. Normally this would set focus to the browser window, so I'd like to keep that behaviour.</p>
  
  <p>Hence my question: Is it possible to programatically give focus to the browser's chrome? Even better if I can mimic both forward <em>and</em> backward tabbing. Also I'd like to avoid adding extra tabbable components before/after the flash if possible, unless I can make them effectively invisible to both the mouse <em>and</em> keyboard.</p>