Need art as folder.jpeg

I've got mp3tag to export embedded artwork ok, but it's exporting and naming it after the album it was exported from. I need the exported artwork to be simply called "folder.jpeg", anyone know how I can do this?

The format string I'm using at the moment is;

$validate($trim(%BAND%) - $trim(%ALBUM%),)

I've already answered this in the other thread..
Format string: folder

Sorry Dano, I thought you said "folder" was the string for just exporting the artwork. I'm starting to realise that the string in the "Export Cover To File" action defines what the file is called, and not what action is performed.

Thanks for clearing that up for me anyway.