var xy = new ScreenResolution;
var windowWidth = 630;
var windowHeight = 460;
function ScreenResolution()
{
this.screenWidth = screen.width;
this.screenHeight = screen.height;
}
if (parseInt(navigator.appVersion)>4) {
 if (navigator.appName="Netscape") {
  windowWidth = window.innerWidth;
  windowHeight = window.innerHeight;
 }
 if (navigator.appName.indexOf("Microsoft")!=-1) {
  windowWidth = document.body.offsetWidth;
  windowHeight = document.body.offsetHeight;
 }
}
alert("Your screen resolution width is " + xy.screenWidth + "\n\nYour screen resoltuion height is " + xy.screenHeight + "\n\nThe width of your current window is "+windowWidth+"\n\n" +"The height of your current window is "+windowHeight
)