Thanks for the add-on!
The admin area works well. But I have a problem though... my secret link doesn't work.. Did I paste the tags wrongly?
<a href="index.php?showimage=<IMAGE_PREVIOUS_ID>"><img id="image" src="./images/<IMAGE_NAME>" <ATTRIBUT_NAME> alt="<IMAGE_TITLE>" title="<IMAGE_PREVIOUS_TITLE>" width="<IMAGE_WIDTH>" height="<IMAGE_HEIGHT>" /></a>
Also, I noticed that you'll need to be logged in to the admin area prior to uploading the add-on, else it'll return a "fatal error". Thought you'd like to know