[TYPO3] TMENU hide (title-)text, not the link

[Hans van Dijk]

I have the following problem:
I have a TMENU, which sets:
allWrap = <div class="mainmenuitem{elementUid}">|</div>
In the CSS I have images with different colors and TEXT IN THE IMAGE.

The result is:
<div class="mainmenuitem108"><a href="index.php?id=108">Pagtitletext</ 
a></div>

What I want is:
<div class="mainmenuitem108"><a href="index.php?id=108"></a></div>

Does anybody know how to fix this?
Thank you for your answer...

Regards, Hans