function registerTicker(tickerId) {
    var ticker = document.getElementById(tickerId);
    if (ticker.children != null) {
        for (var i = 0; i < ticker.children.length; i++) {
            if (i != 0) {
                ticker.children[i].style.display = 'none';
            }
        }
    }
    window.setInterval("toggleTicker('" + tickerId + "');", 5000);
}

function toggleTicker(tickerId) {
    var shownId = 0;
    var ticker = document.getElementById(tickerId);
    if (ticker.children != null) {
        for (var i = 0; i < ticker.children.length; i++) {
            if (ticker.children[i].style.display != 'none') {
                shownId = i;
            }
        }
        if (ticker.children[shownId] != null) {
            ticker.children[shownId].style.display = 'none';
            
            shownId++;
            if (shownId == ticker.children.length) {
                shownId = 0;
            }
            ticker.children[shownId].style.display = 'block';
        }
    }
}