function DetailFenster(parameter) {
     MeinFenster1 = window.open("photo.php?bildname="+parameter, "detailfenster", "width=680, height=540, left=20, top=20, menubar=no, location=no, scrollbars=no");
     MeinFenster1.moveTo((screen.width-680)/2,(screen.height-540)/2);
     MeinFenster1.focus();
   }