var c2cframe = null;
  function openClickToCallFrame(userID, buttonID) {
    if(c2cframe != null) {
      if(!c2cframe.closed) {
        c2cframe.close();
      }
    }
/*
(de=Deutsch, en=Englisch, fr=Franzùsisch, es=Spanisch, it=Italienisch)*/
    c2cframe = open("http://hoteldirect.teleconf.de:80/callback/callbackinitiation.do" + 
                    "?NEW=NEW" + 
                    "&UserID=" + userID + 
                    "&BUTTONID=" + buttonID 
              //  +  "&Locale=de"
              //  +  "&Locale=en"
              //  +  "&Locale=fr"
              //  +  "&Locale=es"
              //  +  "&Locale=it"
                   , "ClickToCallFrame", "width=215,height=330,resizable=yes,left=50,top=50");
    return false;
  }