function popup(url, name, width, height)
{
    fenster = open(url, name, "width=" + width +", height=" + height + ", left=300, top=300, status=1, toolbar=no, menubar=no, scrollbars=no");
    fenster.focus;
    return false;
}

function gallery(url)
{
    fenster = open(url, 'Artikel', "width=1050, height=660, left=100, top=100, status=1, toolbar=no, menubar=no, scrollbars=yes");
    fenster.focus;
    return false;
}

function menu_h(elementId)
{
    window.document.getElementById(elementId).className = "menulink_h";
    return false;
}

function menu_n(elementId)
{
    window.document.getElementById(elementId).className = "menulink_n";
    return false;
}

function changeimage(elementId, imagename)
{
    window.document.getElementById(elementId).src = "images/" + imagename;
    return false;
}