I don't know what's so dirty about it. It certainly is quick. In fact, this is basically the recommended method. If, for organizational purposes, you wanted to have descriptive text in the tags and comments (both of which would only be seen in the source code) so it would be easier to recognize later what you had done (by you or anyone looking at the code), you could do it like so:
HTML Code:
<!-- Poster Group -->
<a href="01.jpg" rel="lightbox[posters]" title="Poster One">See sample poster set</a>
<div style="display:none;"><!-- Unseen Links in the Poster Group -->
<a href="02.jpg" rel="lightbox[posters]" title="Poster Two">Anything You Want Here</a>
<a href="03.jpg" rel="lightbox[posters]" title="Poster Three">More Descriptive Text</a>
</div><!-- End Poster Group -->
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