* { 
  margin: 0;
  padding: 0;
  border-collapse: collapse;
  border-spacing: 0;
  vertical-align: top;
}

a.extern:before {
  content: url(http://www.inzinger.org/img/extern-link.gif);
}

a.download:before {
  content: url(http://www.inzinger.org/img/download-link.gif);
}

a.intern:before {
  content: url(http://www.inzinger.org/img/intern-link.gif);
}

a.anker:before {
  content: url(http://www.inzinger.org/img/anker-link.gif);
}