function popup(detoo_chat, windowname)
  {
    if (! window.focus)return true;
      var href;
    if (typeof(detoo_chat) == 'string')
      href=detoo_chat;
    else
      href=detoo_chat.href;
    window.open(href, windowname, 'width=400,height=450,resizable=yes,menubar=no,location=no,status=no,scrollbars=yes');
    return false;
  }