function addDivLayer(id, width, height, top, left)
{
  var oChild = document.createElement("DIV");
  
  oChild.id               = id;
  oChild.style.position   = 'absolute';
  oChild.style.width      = width + 'px';
  oChild.style.height     = height + 'px';
  oChild.style.left       = left +'px';
  oChild.style.top        = top +'px';
  oChild.style.visibility = 'hidden';

  return oChild;
}

function closeDivLayer(id)
{
  var oChild = document.getElementById(id);
  var oParent = oChild.parentNode;
  
  if (oChild != null && oParent != null)
  {
    oParent.removeChild(oChild);
  }
}

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
 { // Explorer Mac...would also work in Explorer 6 Strict, 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;
 }

 arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight)
 return arrayPageSize;
}