Scale up undersized images to fill div

css min-width:100% did the trick

Also replaced == with === to make Crawford happy
http://javascript.crockford.com/code.html
Keep grid from breaking on covers with different proprotions

Set a fixed height on the galleryItem div. This does end up with the
bottom of the images being cropped, but that's acceptable for now.

Could stand to be tweaked further, but that polishing can wait until
later.

Added a new @media selector to handle HDTV resolutions.