function savana_chat(modal,cis) {
  if(cis<1) { cis='0'; }
  savana_win = window.open ("http://napoveda.savana.cz/chat/index.php?chat="+cis, "savana_chat", "toolbar=0,location=0,directories=0,menubar=0,status=0,scrollbars=0,resizable=0,width=484,height=504");
}