function alertSize()
{
   var myWidth = 0, myHeight = 0;

   if (typeof(window.innerWidth ) == 'number')
   {
     //Non-IE
      myWidth  =  window.innerWidth;
      myHeight =  window.innerHeight;
   }
   else if
      (
         document.documentElement &&
         (
            document.documentElement.clientWidth ||
            document.documentElement.clientHeight
         )
      )
   {
      //IE 6+ in 'standards compliant mode'
      myWidth  =  document.documentElement.clientWidth;
      myHeight =  document.documentElement.clientHeight;
   }
   else if
      (
         document.body &&
         (
            document.body.clientWidth ||
            document.body.clientHeight
         )
      )
   {
      //IE 4 compatible
      myWidth = document.body.clientWidth;
      myHeight = document.body.clientHeight;
   }
   
   window.alert('Width = ' + myWidth + '\nHeight = ' + myHeight);
}