function openWindow(url, name, w, h)
{
  if (!nw || nw.closed)
  {
	nw = window.open(url, name, 'scrollbars=yes,resizable=no,status=no,location=no,menubar=no,width=' + w + ',height=' + h);
  } 
  else 
  {
	nw.close()
	nw = window.open(url, name, 'width=' + w + ',height=' + h)
	nw.focus()
  }
}