title: How to know client size of browser window?
body: <p>I want to know client size of browser window. I use simple script:</p>
  
  <pre><code>wwidth  = window.innerWidth
  wheight = window.innerHeight
  </code></pre>
  
  <p>but it is not work in IE8,IE9. How to know this params using extjs in all form of browsers ?</p>