(function () {
         var pageWidth = window.innerWidth;
         var pageHeight = window.innerHeight;
         var broswerWidth = window.outerWidth;
         var broswerHeight = window.outerHeight;
         alert(pageWidth + " " + pageHeight);
         alert(broswerWidth + " " + broswerHeight);
         if (typeof pageWidth != "number") {
             if (document.compatMode == "CSS1Compat") {  //The standard mode
                 pageWidth = document.documentElement.clientWidth;
                 pageHeight = document.documentElement.clientHeight;
             } else {
                 pageWidth = document.body.clientWidth;
                 pageHeight = document.body.clientHeight;
             }
         } 
     })();

    (function btnFun() {
        var leftPos = (typeof window.screenLeft == "number") ? window.screenLeft :
            window.screenX;
        var topPos = (typeof window.screenTop == "number") ? window.screenTop :
                         window.screenY;
        alert(leftPos + " " + topPos);
        //alert(window.screenLeft+" "+window.screenTop);
    })();