I followed the directions for implementing Lightbox and ended up with the following lines in my theme's show.php file:
echo '<p>Click the Image for Larger View</p>';
echo display_files_for_item(array( 'linkAttributes'=>array('rel'=>'lightbox[gallery]')));
echo display_files_for_item(array('imageSize' => 'thumbnail'));
The problem is that when I click on a thumbnail I want Lightbox to display images from archives/fullsize rather than archives/files. How could I go about doing this?