function menuUmschalten(element, an) {
    if (an == true) {
        element.style.backgroundColor = "#eeeeee";
        element.style.cursor = "pointer";
    }
    else {
        element.style.backgroundColor = "#E3E3E3";
        element.style.cursor = "";
    }
}

function menuClick(element, id) {
    element.style.backgroundColor = "#E3E3E3";
    location.href = "index.php?seite=" + id;
}

function zeigeBild(nr, breite_px, hoehe_px) {
    pos_left = (screen.width - breite_px) / 2.0;
    pos_top = (screen.height - hoehe_px) / 2.0;

    win = window.open("zeigebild.php?nr=" + nr, "bild", "width=" + breite_px + ",height=" + hoehe_px + ",left=" + pos_left + ",top=" + pos_top);
    if (!win && !bild) {
        alert("Bitte Popup-Blocker deaktivieren");
    }
}