Fantastic app! It works great but I have found a problem.
If you have images stored at a level lower than Joomla it gets a bit confused.
I put in an image directory ../otherimages and it does give me a list of all the images in that directory though the preview is broken and source address is wrong. (its just appends the ../ into the address.
Seems the code needs to take into account someone who wants to store images outside of Joomla! My client wants this - you know clients! ??
It would be a life saver to see this fix added at some time.