var shown = false;

function check_form(id) {
    i1 = document.getElementById("nick_"+id);
    i2 = document.getElementById("title_"+id);
    i3 = document.getElementById("text_"+id);
    
    if (i1.value == "") {
        alert("Musíte vyplnit své jméno.");
        return false;
    }
    if (i2.value == "") {
        alert("Musíte vyplnit titulek.");
        return false;
    }
    if (i3.value == "") {
        alert("Musíte vyplnit text.");
        return false;
    }
    return true;
}


function hide_form() {
    var f = document.getElementById("hidden_form_null");
    var ff = document.getElementById("hidden_form_form");
    ff.elements[0].value = '';
    ff.elements[1].value = '';
    ff.elements[2].value = '';
    f.style.display = "none";
    shown = false;
}



function show_form (id) {
 //   alert(document.getElementById("content").width);
    if (shown == false) {
        var f = document.getElementById("hidden_form_null"); //Skryty formular (prvek TABLE)
        var i = document.getElementById("hidden_text"); //HIDDEN input ve skrytem FORMu
        var t = document.getElementById("comment_"+id); //div ze ktereho vezmem clanek na ktery reagujem
        var t2 = document.getElementById("comment_reakce"); //div ve kterem se zobrazi info na HIDDEN FORMu
        var y = t.offsetTop - 200;
        var x = 50;
        i.value = id;
    
    
        t2.childNodes[0].childNodes[0].innerHTML = t.childNodes[0].childNodes[0].innerHTML; //nick
        t2.childNodes[0].childNodes[1].innerHTML = t.childNodes[0].childNodes[1].innerHTML; //title
        t2.childNodes[0].childNodes[2].innerHTML = t.childNodes[0].childNodes[2].innerHTML; //date
        t2.childNodes[1].innerHTML = t.childNodes[1].innerHTML; //text
        f.style.display = "block";
        f.style.top = y+"px";
        f.style.left = x+"px";
        
        shown = true;
    }
}


function check_text(txt,msg) {
    if (txt.value.length > 500) {
        txt.value = txt.value.substring(0,500);
    }
    document.getElementById(msg).innerHTML = 500-txt.value.length;
    
}