Copy the function
theme_display_thumbnails to
themes/<your_theme>/theme.php, if it does not exist.
Then, find
if ($aid == 'lastalb') {
$params = array('{CELL_WIDTH}' => $cell_width,
'{LINK_TGT}' => "thumbnails.php?album={$thumb['aid']}",
'{THUMB}' => $thumb['image'],
'{CAPTION}' => $thumb['caption'],
'{ADMIN_MENU}' => $thumb['admin_menu']
);
} else {
$params = array('{CELL_WIDTH}' => $cell_width,
'{LINK_TGT}' => "displayimage.php?album=$aid$cat_link&pos={$thumb['pos']}$uid_link",
'{THUMB}' => $thumb['image'],
'{CAPTION}' => $thumb['caption'],
'{ADMIN_MENU}' => $thumb['admin_menu']
);
}
and replace with
if ($aid == 'lastalb') {
$params = array('{CELL_WIDTH}' => $cell_width,
'{LINK_TGT}' => "thumbnails.php?album={$thumb['aid']}",
'{THUMB}' => $thumb['image'],
'{CAPTION}' => $thumb['caption'],
'{ADMIN_MENU}' => $thumb['admin_menu']
);
} elseif (is_numeric($aid)) {
$params = array('{CELL_WIDTH}' => $cell_width,
'{LINK_TGT}' => "displayimage.php?pos=-{$thumb['pid']}",
'{THUMB}' => $thumb['image'],
'{CAPTION}' => $thumb['caption'],
'{ADMIN_MENU}' => $thumb['admin_menu']
);
} else {
$params = array('{CELL_WIDTH}' => $cell_width,
'{LINK_TGT}' => "displayimage.php?album=$aid$cat_link&pos={$thumb['pos']}$uid_link",
'{THUMB}' => $thumb['image'],
'{CAPTION}' => $thumb['caption'],
'{ADMIN_MENU}' => $thumb['admin_menu']
);
}