[TYPO3] Wrap mailto-links with letter-image

[Martin Rud]

Hi list,

I want to wrap all links of type mailto with something (for instance 
with an image of a letter before). That means that all links as this

	<a href="mailto:test at test.com">mail me!</a>

should be outputtet

	<img src="my/path/letter.gif"><a href="mailto:test at test.com">mail me!</a>

I have not been able to Google a good answer...

Any ideas for some typoscript?

Regards,
Martin