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function  getPageSize(){
  var xScroll, yScroll;
  if (window.innerHeight && window.scrollMaxY) {
         xScroll = document.body.scrollWidth;
         yScroll = window.innerHeight + window.scrollMaxY;
  } else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
         xScroll = document.body.scrollWidth;
         yScroll = document.body.scrollHeight;
  } else if (document.documentElement && document.documentElement.scrollHeight > document.documentElement.offsetHeight){ // Explorer 6 strict mode
         xScroll = document.documentElement.scrollWidth;
         yScroll = document.documentElement.scrollHeight;
  } else { // Explorer Mac...would also work in Mozilla and Safari
         xScroll = document.body.offsetWidth;
         yScroll = document.body.offsetHeight;
  }
  var windowWidth, windowHeight;
  if (self.innerHeight) { // all except Explorer
         windowWidth = self.innerWidth;
         windowHeight = self.innerHeight;
  } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
         windowWidth = document.documentElement.clientWidth;
         windowHeight = document.documentElement.clientHeight;
  } else if (document.body) { // other Explorers
         windowWidth = document.body.clientWidth;
         windowHeight = document.body.clientHeight;
  }
  // for small pages with total height less then height of the viewport
  if(yScroll < windowHeight){
         pageHeight = windowHeight;
  } else {
         pageHeight = yScroll;
  }
  // for small pages with total width less then width of the viewport
  if(xScroll < windowWidth){
         pageWidth = windowWidth;
  } else {
         pageWidth = xScroll;
  }
  
  return [pageWidth,pageHeight,windowWidth,windowHeight];
}