function addRssLink(rssLink) {
    elements = document.getElementsByTagName("head");
    if (elements.length == 1) {
        head = elements[0];
        linkTag = document.createElement("link");
        linkTag.setAttribute("type", "application/rss+xml");
        linkTag.setAttribute("title", "HBO-Kennisbank RSS");
        linkTag.setAttribute("rel", "alternate");
        linkTag.setAttribute("href", rssLink);
        head.appendChild(linkTag);
    }
}