function myFunctionScreen() {
        var x = "Total width : " + screen.width + "px";
        var xx = "Total height : " + screen.height + "px";
        var x1 = "Color Depth " + screen.colorDepth;
        var x2 = "Pixel Depth " + screen.pixelDepth;
        document.getElementById('demo').innerHTML = x + " " + xx + " " + x1 + " " + x2;
      }