function showVVS(id) 
{
    var vvsListe = document.getElementById("allvvs");
    var vvsChosen = id.toString();
    var vvsAntal = vvsListe.childNodes.length;
    for (var i = 0; i < vvsAntal; i++) {
        document.getElementById("allvvs").childNodes[i].className = "hidevvs";
    }
    document.getElementById(vvsChosen).className = "showvvs";
}