function showhide(id, id2){
    if (document.getElementById){
        obj = document.getElementById(id);
        obj2 = document.getElementById(id2);
        if (obj.style.display == "none"){
            obj.style.display = "inline";
            obj2.innerHTML = "Zwiń";
        } else {
            obj.style.display = "none";
            obj2.innerHTML = "Rozwiń";
        }
    }
}