A function of JavaScript to get the visual height and width of the current page

    function getpagesize () {        var  xscroll,yscroll;        if  (window.innerheight &&  window.scrollmaxy) {            xscroll  = window.innerwidth + window.scrollmaxx;             yScroll = window.innerHeight + window.scrollMaxY;         }        else if  ( Document.body.scrollheight > document.body.offsetheight) {          // all but Explorer Mac             xScroll = document.body.scrollWidth;             yscroll = document.body.scrollheight;        }else{//  Explorer mac...would also work in explorer 6 strict, mozilla and  Safari            xScroll =  Document.body.offsetwidth;            yscroll  = document.body.offsetHeight;        }         var windowWidth, windowHeight;         if  (self.innerheight) { // all except explorer             windowWidth = self.innerWidth;             windowHeight = self.innerHeight;         }        else if  (document.documentelement &&  Document.documentElement.clientHeight) {        // explorer 6  strict mode            windowwidth  = document.documentElement.clientWidth;             windowHeight = document.documentElement.clientHeight;         }        else if  (document.body) {//  other explorers            windowwidth =  document.body.clientWidth;             windowheight = document.body.clientheight;        }          // for small pages with total height less then height  of the viewport        var pageWidth,pageHeight;         if (yscroll < windowheight) {             pageHeight = windowHeight;         }else{             pageheight = yscroll;        }         if (xscroll < windowwidth) {             pagewidth = windowwidth;        } else{            pagewidth = xscroll;         }        return {              "PageWidth":p agewidth,              "PageHeight":p ageheight        }     }//alert (GetPageSize (). PageHeight)