[TYPO3] How to add a class to anchors?

[Andreas Balzer]

Hi!
I have several of those anchors on my page automatically created by TYPO3:
<a id="c918">
</a>

Is it possible to add a class="xyz" to every anchor automatically?
e.g.

<a id="c918" class="xyz">
</a>

How to do that? (I use css styled content)

Greetings
Andreas