function showProducts(subject, products) {
    hideAllProducts();
    products = products.split("-");
    for (var i = 0 ; i < products.length ; i++) {
        showProduct(products[i]);
    }
    setPageHeading("&Auml;mnesomr&aring;de: " + subject);
}

function hideAllProducts() {
    products = document.getElementsByName("product-list-item");
    for (var i = 0 ; i < products.length ; i++) {
        products[i].style.display = "none";
    }
}

function showProduct(prodid) {
    document.getElementById("product-" + prodid).style.display = "block";
}

function setPageHeading(text) {
    headings = document.getElementsByTagName("h1");
    heading = headings[0];
    heading.innerHTML = text;
}