// Browser Window Size and Position
// copyright Stephen Chapman, 3rd Jan 2005, 8th Dec 2005
// you may copy these functions but please keep the copyright notice as well
function pageWidth() 
{return window.innerWidth != null? window.innerWidth : document.documentElement && document.documentElement.clientWidth ?       
document.documentElement.clientWidth : document.body != null ? document.body.clientWidth : null;} 

function pageHeight() 
{return  window.innerHeight != null? window.innerHeight : document.documentElement && document.documentElement.clientHeight ? 
 document.documentElement.clientHeight : document.body != null? document.body.clientHeight : null;} 
 
function posLeft() 
{return typeof window.pageXOffset != 'undefined' 
 ? window.pageXOffset :document.documentElement && document.documentElement.scrollLeft ? document.documentElement.scrollLeft : document.body.scrollLeft 
 ? document.body.scrollLeft : 0;} 
 
function posTop() 
{return typeof window.pageYOffset != 'undefined' ?  window.pageYOffset : document.documentElement && document.documentElement.scrollTop 
 ? document.documentElement.scrollTop : document.body.scrollTop ? document.body.scrollTop : 0;} 
 
function posRight() {return posLeft()+pageWidth();} 

function posBottom() {return posTop()+pageHeight();}