def navbarItems(activePage):
    pages = ["Students", "Assistants", "Experiments", "Appointments", "Groups", "Users"]
    items = ""
    for page in pages:
        active = ""
        lowerPage = page.lower().replace(" ", "_")
        if lowerPage == activePage:
            active = " active"
        items += '<a class="nav-link' + active + '" href="' + lowerPage + '">' + page + '</a>\n'
    return items