Hello,
As far as your images lining up side by side, I was able to find some of your auctions did that when the browser window was stretched wide enough to fit them on one line. So you'll just want to add a line break ( <br /> ) after images that are followed by another image.
Sorry I can't be of much help with the sound issue (no audio at my workstation). My one guess would be try changing loop="1" to loop="0".