//---------------------------------Change CSS style---------------------------------
function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}

function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
  }
  return null;
}

function getPreferredStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1
       && a.getAttribute("rel").indexOf("alt") == -1
       && a.getAttribute("title")
       ) return a.getAttribute("title");
  }
  return null;
}

function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}

window.onload = function(e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}


window.onunload = function(e) {
    var title = getActiveStyleSheet();
    createCookie("style", title, 365);
    var completeURL = window.location;
    createCookie("url", completeURL, 365);
}

//---------------------------------end of change---------------------------------

function countChar(textareaName,spanName){
    var max=100;
    document.getElementById(spanName).innerHTML=max-document.getElementById(textareaName).value.length;
    if(document.getElementById(textareaName).value.length>=max){
        document.getElementById(textareaName).value=document.getElementById(textareaName).value.substring(0, max);
	document.getElementById(spanName).innerHTML=0;
	alert("Je max povoleno 100 znak\u016f!!!");
    }
}
function controll() {
    if (document.getElementById("nick").value == "") {
        alert("Nick musí být vyplňen!");
        document.getElementById("nick").focus();
        document.getElementById("nick").setAttribute("class", "error1");
        return false;
    }else {
        document.getElementById("nick").setAttribute("class", "valid");
    }

    if (document.getElementById("pass").value == "") {
        alert("Heslo musí být vyplňen!");
        document.getElementById("pass").focus();
        document.getElementById("pass").setAttribute("class", "error1");
        return false;
    }else {
        document.getElementById("pass").setAttribute("class", "valid");
    }
}

function controlg() {
    if (document.getElementById("predmet").value == "") {
        alert("Předmět musí být vyplňen!");
        document.getElementById("predmet").focus();
        document.getElementById("predmet").setAttribute("class", "error1");
        return false;
    }else {
        document.getElementById("predmet").setAttribute("class", "valid");
    }
    if (document.getElementById("vcode").value == "") {
        alert("Kód musí být vyplňen!");
        document.getElementById("vcode").focus();
        document.getElementById("vcode").setAttribute("class", "error1");
        return false;
    }else {
        document.getElementById("vcode").setAttribute("class", "valid");
    }
}
function controln() {
    if (document.getElementById("name").value == "") {
        alert("Jméno musí být vyplňen!");
        document.getElementById("name").focus();
        document.getElementById("name").setAttribute("class", "error1");
        return false;
    }else {
        var str = document.getElementById("name").value;
        document.getElementById("name").value = trim(str);
        document.getElementById("name").setAttribute("class", "valid");
    }
    if (document.getElementById("surname").value == "") {
        alert("Přijmení musí být vyplňen!");
        document.getElementById("surname").focus();
        document.getElementById("surname").setAttribute("class", "error1");
        return false;
    }else {
        var str = document.getElementById("surname").value;
        document.getElementById("surname").value = trim(str);
        document.getElementById("surname").setAttribute("class", "valid");
    }
    if (document.getElementById("username").value == "") {
        alert("Nick musí být vyplňen!");
        document.getElementById("username").focus();
        document.getElementById("username").setAttribute("class", "error1");
        return false;
    }else {
        var str = document.getElementById("username").value;
        document.getElementById("username").value = trim(str);
        document.getElementById("username").setAttribute("class", "valid");
    }

    if (document.getElementById("password").value == "") {
        alert("Heslo musí být vyplňen!");
        document.getElementById("password").focus();
        document.getElementById("password").setAttribute("class", "error1");
        return false;
    }else {
        document.getElementById("password").setAttribute("class", "valid");
    }

    if (document.getElementById("password2").value == "") {
        alert("Ověřovací heslo musí být vyplňen!");
        document.getElementById("password2").setAttribute("class", "error1");
        document.getElementById("password2").focus();
        if (document.getElementById("password2").value == document.getElementById("password").value) {
            alert("Ověřovací heslo musí být stejný jako Heslo");
            document.getElementById("password2").setAttribute("class", "error1");
            return false;
        }else {
        document.getElementById("password2").setAttribute("class", "valid");
        }
        return false;
    }else {
        document.getElementById("password2").setAttribute("class", "valid");
    }

    if (document.getElementById("email").value == "") {
        alert("E-mail musí být vyplňen!");
        document.getElementById("email").focus();
        document.getElementById("email").setAttribute("class", "error1");
        return false;
    }else {
        document.getElementById("email").setAttribute("class", "valid");
    }
    
    if (document.getElementById("email").value != "") {
        var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
        if(reg.test(document.getElementById("email").value) == false) {
            alert('Invalid Email Address');
            document.getElementById("email").setAttribute("class", "error1");
            return false;
        }else {
            document.getElementById("email").setAttribute("class", "valid");
        }
    }
}

function controlr() {
	var ok;
    if (document.getElementById("name").value == "") {
        alert("Jméno musí být vyplňen!");
        document.getElementById("name").focus();
        document.getElementById("name").setAttribute("class", "error1");
        ok = false;
    }else {
        var str = document.getElementById("name").value;
        document.getElementById("name").value = trim(str);
        document.getElementById("name").setAttribute("class", "valid");
        ok = true;
    }
    if (document.getElementById("surname").value == "") {
        alert("Přijmení musí být vyplňen!");
        document.getElementById("surname").focus();
        document.getElementById("surname").setAttribute("class", "error1");
        ok = false;
    }else {
        var str = document.getElementById("surname").value;
        document.getElementById("surname").value = trim(str);
        document.getElementById("surname").setAttribute("class", "valid");
        ok = true;
    }
    if (document.getElementById("datum").value == "") {
        alert("Datum musí být vyplňen!");
        document.getElementById("datum").focus();
        document.getElementById("datum").setAttribute("class", "error1");
        ok = false;
    }else {
        var str = document.getElementById("datum").value;
        document.getElementById("datum").value = trim(str);
        document.getElementById("datum").setAttribute("class", "valid");
        ok = true;
    }

    if (document.getElementById("cas").value == "") {
        alert("Čas musí být vyplňen!");
        document.getElementById("cas").focus();
        document.getElementById("cas").setAttribute("class", "error1");
        ok = false;
    }else {
        document.getElementById("cas").setAttribute("class", "valid");
        ok = true;
    }

    if (document.getElementById("email").value == "") {
        alert("E-mail musí být vyplňen!");
        document.getElementById("email").focus();
        document.getElementById("email").setAttribute("class", "error1");
        ok = false;
    }else {
        document.getElementById("email").setAttribute("class", "valid");
        ok = true;
    }
    
    if (document.getElementById("email").value != "") {
        var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
        if(reg.test(document.getElementById("email").value) == false) {
            alert('Invalid Email Address');
            document.getElementById("email").setAttribute("class", "error1");
            ok = false;
        }else {
            document.getElementById("email").setAttribute("class", "valid");
            ok = true;
        }
    }
    return ok;
}

function trim(stringToTrim) {
	return stringToTrim.replace(/^\s+|\s+$/g,"");
}