// 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();}