function popup(url)
{
  params  = 'width='+screen.width;
  params += ', height='+screen.height;
  params += ', top=0, left=0'
  params += ', fullscreen=yes';
  params += ', scrollbars=none';
  
  newwin=window.open(url,'windowname', params);
  if (window.focus) {newwin.focus()}
  return false;
}