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* Get Viewport Dimensions
* returns object with viewport dimensions to match css in width and height properties
* ( source: http://andylangton.co.uk/blog/development/get-viewport-size-width-and-height-javascript )
*/
function updateViewportDimensions() {
  var w=window,d=document,e=d.documentElement,g=d.getElementsByTagName('body')[0],x=w.innerWidth||e.clientWidth||g.clientWidth,y=w.innerHeight||e.clientHeight||g.clientHeight;
  return { width:x,height:y };
}
// setting the viewport width
var viewport = updateViewportDimensions();