// Declare and set myWidth and myHeight for the browser size

var myWidth = 0, myHeight = 0;
var w=window,d=document,e=d.documentElement,g=d.getElementsByTagName('body')[0];
 myWidth=w.innerWidth||e.clientWidth||g.clientWidth;
 myHeight=w.innerHeight||e.clientHeight||g.clientHeight;
  //window.alert( 'Width = ' + myWidth );
  //window.alert( 'Height = ' + myHeight );