function changeMailServer(frm, blnChangeOnly) {
  // Google Apps:
  if(/@g\.fajkus\.cz$/i.test(frm.userid.value)) {
    frm.passwd.value = '';
    frm.passwd.disabled = true;    
    window.location.href = 
      "https://www.google.com/a/g.fajkus.cz/ServiceLogin?service=mail&passive=true&Email=" + frm.userid.value.replace(/@.*$/,'') +
         "&continue=http%3A%2F%2Fmail.google.com%2Fa%2Fg.fajkus.cz%2F";
    return false;
  } else {
    frm.passwd.disabled = false;
  }
  if(blnChangeOnly) return;
 
  // Ignum classic:
  var strActionMask = "https://$/login.cgi";
  var aMailServers = new Array();
  aMailServers["default"] = "mail.ignum.cz";
  aMailServers["fajkus.cz"] = "mail.ignum.cz";
  aMailServers["hssro.cz"] = "mail3.ignum.cz";
  aMailServers["doupal.cz"] = "mail.ignum.cz";
  //aMailServers["rkstaviva.cz"] = "mail3.ignum.cz";
  
  var strRequestedDomain = frm.userid.value.replace(/^.*@/, '');
  var result = aMailServers["default"];
  if(typeof(aMailServers[strRequestedDomain]) != 'undefined') result = aMailServers[strRequestedDomain];
  frm.action = strActionMask.replace(/\$/, result);
  return true;
}