// Find the height of the viewport
  function windowHeight() {
      // A shortcut, in case we’re using Internet Explorer 6 in Strict Mode
      var de = document.documentElement;
  
      // If the innerHeight of the browser is available, use that
      return self.innerHeight ||
  
          // Otherwise, try to get the height off of the root node
          ( de && de.clientHeight ) ||
  
          // Finally, try to get the height off of the body element
          document.body.clientHeight;
  }
  
  // Find the width of the viewport
  function windowWidth() {
      // A shortcut, in case we’re using Internet Explorer 6 in Strict Mode
      var de = document.documentElement;
  
      // If the innerWidth of the browser is available, use that
      return self.innerWidth ||
  
          // Otherwise, try to get the width off of the root node
          ( de && de.clientWidth ) ||
  
          // Finally, try to get the width off of the body element
          document.body.clientWidth;
  }