If you just want one thumbnail or link, you still need the others in the group, but they require no text or image, so need not be seen. Many have done this, ex:
Code:
<a href="first_img.jpg" rel="lightbox[mygroup]">Trigger Text or Image Tag</a>
<a href="second_img.jpg" rel="lightbox[mygroup]"></a>
<a href="third_img.jpg" rel="lightbox[mygroup]"></a>
<a href="forth_img.jpg" rel="lightbox[mygroup]"></a>
<a href="fifth_img.jpg" rel="lightbox[mygroup]"></a>
If your styles create layout problems with the unseen links (they probably will not), just remove the display of those items:
Code:
<a href="first_img.jpg" rel="lightbox[mygroup]">Trigger Text or Image Tag</a>
<div style="display:none;">
<a href="second_img.jpg" rel="lightbox[mygroup]"></a>
<a href="third_img.jpg" rel="lightbox[mygroup]"></a>
<a href="forth_img.jpg" rel="lightbox[mygroup]"></a>
<a href="fifth_img.jpg" rel="lightbox[mygroup]"></a>
</div>
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