function openwin(url,w,h,s) {
  var x = 100;
  var y = 50;
  if (screen.width) x = Math.round((screen.width - w) / 2);
  if (screen.height) y = Math.round((screen.height - h) / 2) - 30;
  if (s == 1) {
    scrollbars=',scrollbars=yes';
    w += 20;
  } else
    scrollbars='';
  window.open(url,'','top='+y+',left='+x+',width='+w+',height='+h+scrollbars);
  return false;
}