var layerNames = new Array("programm", "quantum", "kontakt");

function showLayer(name) {
    for (i=0; i<layerNames.length; i++) {
        if (name == layerNames[i]) {
            if (name == layerNames[i]) {
                if (document.all) {
                    document.all.tags("div")[name].style.visibility="visible";
                } else if (document.layers) {
                    document.layers[name].visibility="show";
                } else {
                    document.getElementById(name).style.visibility="visible";
                }
            }
        } else {
            hideLayer(layerNames[i]);
        }
    }
}

function hideLayer(name) {
    if (document.all) {
        document.all.tags("div")[name].style.visibility="hidden";
    } else if (document.layers) {
        document.layers[name].visibility="hide";
    } else {
        document.getElementById(name).style.visibility="hidden";
    }
}

function hideLayers() {
    for (i=0; i<layerNames.length; i++) {
        hideLayer(layerNames[i]);
    }
}