function getCookie(name) {
    var dc = document.cookie;
    var prefix = name + "=";
    var begin = dc.indexOf("; " + prefix);
    if (begin == -1) {
        begin = dc.indexOf(prefix);
        if (begin != 0) return null;
    } else {
        begin += 2;
    }
    var end = document.cookie.indexOf(";", begin);
    if (end == -1) {
        end = dc.length;
    }
    return unescape(dc.substring(begin + prefix.length, end));
}

function nastav_osloveni(){
  cas=new Date();
  cas.setTime(cas.getTime()+1000*3600*24*14);
  x=window.prompt('Jak chcete byt oslovovani? Vitejte ...',getCookie('OSLOVENI')); 
  if(x!=null) document.cookie="OSLOVENI="+escape(x)+"; EXPIRES="+cas.toGMTString();
  osloveni();
}

function osloveni(){       
  v=getCookie("OSLOVENI");
  var strong=document.getElementById("osloveni");     
  if(strong!=null){
    if(v!=null && v!='') strong.innerHTML='Vitejte '+v; 
      else strong.innerHTML='';
  }
}