// 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 != null ? document.documentElement.clientWidth : document.body != null ? document.body.clientWidth : null;
}

function pageHeight1() {
  return window.innerHeight != null? window.innerHeight : document.documentElement && document.documentElement.clientHeight > 0 ? document.documentElement.clientHeight : document.body != null ? document.body.clientHeight : null;
}

function pageHeight() {
  if (typeof( window.innerHeight ) == 'number') {
    return window.innerHeight;
  } else if ( !(document.documentElement.clientHeight == 0) ) {
    return document.documentElement.clientHeight;
  } else  {
    return document.body.clientHeight;
  }
}

function posLeft() {
  return typeof window.pageXOffset != 'undefined' ? window.pageXOffset :document.documentElement && document.documentElement.scrollLeft != null ? document.documentElement.scrollLeft : document.body.scrollLeft ? document.body.scrollLeft : 0;
}

function posTop() {
  return typeof window.pageYOffset != 'undefined' ?  window.pageYOffset : document.documentElement && document.documentElement.scrollTop != null ? document.documentElement.scrollTop : document.body.scrollTop ? document.body.scrollTop : 0;
}

function posRight() {
  return posLeft()+pageWidth();
}

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