function popupImpressum(URL){

 	var W = 450;
    var H = (screen.height / 3) * 1.7;
    var LEFT = (screen.width / 2) - (W / 2);
    var TOP = (screen.height / 2) - (H / 2) - 50;
    var GEOM = 'width='+W+',height='+H+',left='+LEFT+',top='+TOP+',location=no,menubar=yes,resizeable=yes,scrollbars=yes,status=yes,toolbar=no';
    WINDOW = window.open(URL,"Window",GEOM);

}