//eseménykezelő regisztrálása
function addEvent(target, eventType, eventFunction){
    if (target.addEventListener){
        target.addEventListener(eventType, eventFunction, false);
    }
    if (target.attachEvent){
        target.attachEvent('on' + eventType, eventFunction);
    }
}

//alert üzenet megjelenítése
function uzenet(szoveg){
    szoveg = szoveg.replace(/"/g,"\\\"");
    window.setTimeout("alert(\""+szoveg+"\");",100);
}

//elem elrejtese/mutatasa
function toggle(htmlelement) {
    element = document.getElementById(htmlelement);
    if(element.style.display == 'none')
        element.style.display = '';
    else
        element.style.display = 'none';
}

function EventPager(direction) {
    var item = document.getElementById('events');
    var hidden = document.getElementById('hidden');
    size = events.length;
    for(i=0;i<size;i++) {
        hidden.innerHTML = events[i];
        if(hidden.innerHTML == item.innerHTML) {
            currentIndex = i;
            break;
        }
    }
    if(currentIndex == size-1 && direction == 'right')
        currentIndex = -1;
    if(currentIndex == 0 && direction == 'left')
        currentIndex = size;
    if(direction == 'left')
        currentIndex--;
    if(direction == 'right')
        currentIndex++;
    item.innerHTML = events[currentIndex];
}