simple way, add this in your details.html:
so:
<a href="{image_url}" onclick="javascript:document.body.innerHTML='<img src=\'{media_src}\'>';print();" >Print Image</a>
search in details.php:
$site_template->register_vars(array(
"next_image_id" => $next_image_id,
and replace:
$site_template->register_vars(array(
"image_url" => $site_sess->url(ROOT_PATH."details.php?".URL_IMAGE_ID."=".$image_row['image_id']),
"next_image_id" => $next_image_id,
mfg Andi