how to determine window size in javascript

Use this snippet to determine the size of an open window. Can be used in many different situations, e.g., for setting the size of a div.

<script type="text/javascript">

if (window.innerWidth)
  theWidth=window.innerWidth;
else if (document.documentElement && document.documentElement.clientWidth)
  theWidth=document.documentElement.clientWidth;
else if (document.body)
  theWidth=document.body.clientWidth;

if (window.innerHeight)
  theHeight=window.innerHeight;
else if (document.documentElement && document.documentElement.clientHeight)
  theHeight=document.documentElement.clientHeight;
else if (document.body)
  theHeight=document.body.clientHeight;
//test
//alert(theWidth+'x'+theHeight);

</script>