How to get Browser Window Size?

How to get Browser Window Size?

function getBroWinSize() {

var objDocEle = document.documentElement;
var objDocBdy = document.body;
var myWidth = 0, myHeight = 0;

if( typeof( window.innerWidth ) == 'number' ) { //Non-IE
myWidth = window.innerWidth;
myHeight = window.innerHeight;
}

else if(objDocEle &&(objDocEle.clientWidth || objDocEle.clientHeight)) { //IE 6+
myWidth = objDocEle.clientWidth;
myHeight = objDocEle.clientHeight;
}

else if(objDocBdy &&(objDocBdy.clientWidth || objDocBdy.clientHeight)){ //IE 4
myWidth = objDocBdy.clientWidth;
myHeight = objDocBdy.clientHeight;
}

window.alert( 'Width = ' + myWidth );
window.alert( 'Height = ' + myHeight );

}//getBroWinSize