function op(w) {
win=window.open(w,"fenstername","width=560,height=630,left=50,top=20,resizable=yes,toolbar=no,scrollbars=yes");
win.focus();
}

function opvar(w,br,ho) {
win=window.open(w,"fensterklein","width=" + br + ",height=" + ho + ",left=50,top=20,resizable=yes,toolbar=no,scrollbars=yes");
win.focus();
}