I got a free 4gb iPod Nano with the recent purchase of my iMac. It came with a dock that looks like it's missing a part, and I can't figure out how to use it. http://www.flickr.com/photos/38018470@N00/144526921/ This isn't my picture, and obviously it doesn't have the the USB cable tied and taped, but this is what the dock looks like. Has anyone seen this thing? Is this normal?