title: Check browser tabs by JavaScript?
body: <p>Can I check if host page for a JavaScript is active by the browser's tab in IE7/FF/Opera? </p>
  
  <p>Checking other tabs than the page where this JS runs would probably be a security risk though.. </p>
  
  <p>My other option is a method I remember by prototype to check if the mouse cursor is active, but it's not that accurate.</p>