//-----------------ČLÁNKY-----------------------//
function validate_articles(form) {
  var nadpis = form.nadpis.value;

  if(nadpis == "") {
    inlineMsg('nadpis','Vyplňte nadpis článku!',2);
    return false;
  }
  return true;
}
//-----------------BANNERY-----------------------//
function validate_banners_picture(form) {
  var banner = form.banner.value;
  if(banner == "") {
    inlineMsg('banner','Vyberte soubor!',2);
    return false;
  }
  return true;
}
function validate_banners_flash(form) {
  var flash = form.flash.value;
  if(flash == "") {
    inlineMsg('flash','Vyplňte kód!',2);
    return false;
  }
  return true;
}
function validate_banners_text(form) {
  var text = form.text.value;
  if(text == "") {
    alert('Vyplňte text!');
    return false;
  }
  return true;
}
//-----------------FOTOGALERIE-----------------------//
function validate_fotogalerie_kat(form) {
  var nazev = form.nazev.value;
  if(nazev == "") {
    inlineMsg('nazev','Vyplňte název Vaší fotogalerie!',2);
    return false;
  }
  return true;
}
function validate_fotogalerie(form) {
  var galerie = form.galerie.value;
  var file = form.main_file.value;
  if(galerie == "") {
    inlineMsg('galerie','Zvolte fotogalerii!',2);
    return false;
  }
  if(file == "") {
    inlineMsg('main_file','Vyberte soubor(y)!',2);
    return false;
  }
  return true;
}
function validate_fotogalerie_update(form) {
  var galerie = form.galerie.value;
  if(galerie == "") {
    inlineMsg('galerie','Zvolte fotogalerii!',2);
    return false;
  }
  return true;
}

//-----------------UŽIVATELÉ-----------------------//
function validate_users(form) {
  var nick = form.nick.value;
  var heslo = form.heslo.value;
  
  if(nick == "") {
    inlineMsg('nick','Vyplňte prosím uživatelské jméno!',2);
    return false;
  }
  if(heslo == "") {
    inlineMsg('heslo','Vyplňte prosím heslo!',2);
    return false;
  }
  if(heslo.length <= 3) {
    inlineMsg('heslo','Heslo musí mít alespoň 4 znaky!',2);
    return false;
  }
  return true;
}
function validate_usersedit(form) {
  var nick = form.nick.value;  
  if(nick == "") {
    inlineMsg('nick','Vyplňte prosím uživatelské jméno!',2);
    return false;
  }
  return true;
}

//-----------------MENU-----------------------//
function validate_menu(form) {
  var polozka = form.polozka.value;
  var linka = form.link.value;
  if(polozka == "") {
    inlineMsg('polozka','Musíte vyplnit název položky!',2);
    return false;
  }
  if(linka == "") {
    inlineMsg('link','Musíte vyplnit odkaz!',2);
    return false;
  }
  return true;
}

//-----------------PODPORA-----------------------//
function validate_podpora(form) {
  var predmet = form.predmet.value;
  var text = form.text.value;
  if(predmet == "") {
    inlineMsg('predmet','Vyplňte prosím předmět zprávy!',2);
    return false;
  }
  if(text == "") {
    alert('Vyplňte prosím text zprávy!');
    return false;
  }
  return true;
}
//-----------------KONTAKT FORM-----------------------//
function validate_kontakt_form(form) {
  var name = form.name.value;
  var email = form.email.value;
  var emailRegex = /^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$/;
  var text = form.text.value;
  var telefon = form.telefon.value;
  if(name == "") {
    inlineMsg('name','Fill in your name please!',2);
    return false;
  }
  else if(telefon != "" && !validPhone(telefon)) {
    inlineMsg('telefon','Bad format of phone number!',2);
    return false;
  }
  else if(email == "") {
    inlineMsg('email','Fill in your e-mail address please!',2);
    return false;
  }
  else if(!email.match(emailRegex)) {
    inlineMsg('email','Bad format of your address',2);
    return false;
  }
  else if(text == "") {
    inlineMsg('text','Fill in your question please!',2);
    return false;
  }
  return true;
}

//-----------------TODO-----------------------//
function validate_todo(form) {
  var name = form.name.value;
  if(name == "") {
    alert('Vyplňte text článku!');
    return false;
  }
  return true;
}
// START OF MESSAGE SCRIPT //

var MSGTIMER = 20;
var MSGSPEED = 5;
var MSGOFFSET = 3;
var MSGHIDE = 3;

// build out the divs, set attributes and call the fade function //
function inlineMsg(target,string,autohide) {
  var msg;
  var msgcontent;
  if(!document.getElementById('msg')) {
    msg = document.createElement('div');
    msg.id = 'msg';
    msgcontent = document.createElement('div');
    msgcontent.id = 'msgcontent';
    document.body.appendChild(msg);
    msg.appendChild(msgcontent);
    msg.style.filter = 'alpha(opacity=0)';
    msg.style.opacity = 0;
    msg.alpha = 0;
  } else {
    msg = document.getElementById('msg');
    msgcontent = document.getElementById('msgcontent');
  }
  msgcontent.innerHTML = string;
  msg.style.display = 'block';
  var msgheight = msg.offsetHeight;
  var targetdiv = document.getElementById(target);
  targetdiv.focus();
  var targetheight = targetdiv.offsetHeight;
  var targetwidth = targetdiv.offsetWidth;
  var topposition = topPosition(targetdiv) - ((msgheight - targetheight) / 2);
  var leftposition = leftPosition(targetdiv) + targetwidth + MSGOFFSET;
  msg.style.top = topposition + 'px';
  msg.style.left = leftposition + 'px';
  clearInterval(msg.timer);
  msg.timer = setInterval("fadeMsg(1)", MSGTIMER);
  if(!autohide) {
    autohide = MSGHIDE;  
  }
  window.setTimeout("hideMsg()", (autohide * 1000));
}

// hide the form alert //
function hideMsg(msg) {
  var msg = document.getElementById('msg');
  if(!msg.timer) {
    msg.timer = setInterval("fadeMsg(0)", MSGTIMER);
  }
}

// face the message box //
function fadeMsg(flag) {
  if(flag == null) {
    flag = 1;
  }
  var msg = document.getElementById('msg');
  var value;
  if(flag == 1) {
    value = msg.alpha + MSGSPEED;
  } else {
    value = msg.alpha - MSGSPEED;
  }
  msg.alpha = value;
  msg.style.opacity = (value / 100);
  msg.style.filter = 'alpha(opacity=' + value + ')';
  if(value >= 99) {
    clearInterval(msg.timer);
    msg.timer = null;
  } else if(value <= 1) {
    msg.style.display = "none";
    clearInterval(msg.timer);
  }
}

// calculate the position of the element in relation to the left of the browser //
function leftPosition(target) {
  var left = 0;
  if(target.offsetParent) {
    while(1) {
      left += target.offsetLeft;
      if(!target.offsetParent) {
        break;
      }
      target = target.offsetParent;
    }
  } else if(target.x) {
    left += target.x;
  }
  return left;
}

// calculate the position of the element in relation to the top of the browser window //
function topPosition(target) {
  var top = 0;
  if(target.offsetParent) {
    while(1) {
      top += target.offsetTop;
      if(!target.offsetParent) {
        break;
      }
      target = target.offsetParent;
    }
  } else if(target.y) {
    top += target.y;
  }
  return top;
}

// preload the arrow //
if(document.images) {
  arrow = new Image(7,80); 
  arrow.src = "msg_arrow.gif"; 
}

function bezDiakrit(string)
{
  var sdiak = "áäčďéěíĺžňóôőö๝úůűüýřžÁÄČĎÉĚÍĹźŇÓÔŐÖŔŠÚŮŰÜÝ؎";

  var spravne = 1;  // 1 = bez diakritiky, 2 = s diakritikou

  for(p = 0; p < string.length; p++)
  { // proverim, jestli v nazvu neni znak s diakritikou...

    if(sdiak.indexOf(string.charAt(p)) != -1)
    {
      spravne = 2;
      break;
    }
    else continue;
  } // end for

  if(spravne > 1) return false;
  else return true;
} 

function validPhone(phonenumber)
{
vyraz = /^[+]?[()/0-9. -]{9,}$/
if (vyraz.test(phonenumber)==true)
  return true;
else 
  return false;
}