The easiest way will be for me to do it myself and then show you where I added/changed code. I'll use the stuff you want so start looking for images you wish to use. For navigation background (on ML wiki it's 1030px by 131px (the blue sky and mountains with the moon behind navigation). The background can be any image but larger is better because you don't want a solid color showing around the edges - especially for larger screens, which will show more. When you find those things let me know. Also I'll need temporary admin rights to make those changes, and you can take them back when it's finished. Cheers.