Adding an album image to multiple songs at once

Hi guys,

I've been messing around with Itunes around for a while. Something I've been never able to do, though is adding an image to an album at once. I mean, you can add it one by one, but turns out I downloaded a 700 or so album and, of course, I don't want to waste my time doing that, so I was wondering if there is any option to set an image to ALL the album's songs at the same time.

Cheers & Thanks!

BTW, I'm running the 11.1.5 version of Itunes.