First of all thanks for this module, it works like a charm. There is just one thing I can't figure out:

I want to apply some custom classes to all my links so that the link
<a href="http://www.facebook.com/sharer.php?u=URL&t=TITLE" title="Auf Facebook teilen" class="service-links-facebook" rel="nofollow" target="_blank">Facebook</a>

says

<a href="http://www.facebook.com/sharer.php?u=URL&t=TITLE" title="Auf Facebook teilen" class="service-links-facebook custum-class-1 custom-class-2" rel="nofollow" target="_blank">Facebook</a>

Could you please help me. Thanks in advance.