function NewWindow(mypage, myname, w, h, scroll)
{
  var winl = (screen.width - w) / 2;
  var wint = (screen.height - h) / 2;
  winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable';
  win = window.open(mypage, myname, winprops);
  if (parseInt(navigator.appVersion) >= 4) {
    win.window.focus();
  }
}