function oeffnefenster (url) {
 fenster = window.open(url, "fenster1", "width=450,height=500,status=no,scrollbars=yes,resizeable=no");
 fenster.focus();
}
function ShowHide(id) {
    obj = document.getElementsByTagName("div");
    if (obj[id].style.display == 'block'){
    obj[id].style.display = 'none';
    }
    else {
    obj[id].style.display = 'block';
    }
}