function fenster_off(url, x, y) {
 popup = window.open(url, "fenster" ,"toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,width=" + x + ",height=" + y);
}

function fenster_on(url, x, y) {
 popup = window.open(url, "fenster" ,"toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=0,width=" + x + ",height=" + y);
}

function fenster_detail(url, x, y) {
 popup = window.open(url, "fenster" ,"toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=1,width=" + x + ",height=" + y);
}