if(self != top)
top.location.href = self.location.href;

function bild(at) {
anhang = (at) ? "?" + at : "";
window.open("bilder/bild.htm"+anhang,"bildfenster","dependent=no,innerWidth=600,innerHeight=450,toolbar=no,status=yes,scrollbars=yes,resizable=yes,menubar=yes,location=no,hotkeys=yes"); }