Get browser screen resolution all platforms

getBrowserResol.js

// http://www.digimantra.com/technology/javascript/detect-screen-or-browser-size-in-javascript/
function getWidth()
  {
    xWidth = null;
    if(window.screen != null)
      xWidth = window.screen.availWidth;
 
    if(window.innerWidth != null)
      xWidth = window.innerWidth;
 
    if(document.body != null)
      xWidth = document.body.clientWidth;
 
    return xWidth;
  }
function getHeight() {
  xHeight = null;
  if(window.screen != null)
    xHeight = window.screen.availHeight;
 
  if(window.innerHeight != null)
    xHeight =   window.innerHeight;
 
  if(document.body != null)
    xHeight = document.body.clientHeight;
 
  return xHeight;
}