background fade in on click
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I am trying get this background to fade in on click. I found one tutorial that was helpful, and I ended up created the code so it has two images, and they fade in and out on click to bring up the picture. 
Here's the work: http://www.mccraymusic.com/bgchangetest.html

Only a couple of issues though: 
1. How do I make this work without the images getting selected at random? I'd like it to just switch from the plain black image to the image with the drum set. (and cross-fade to if possible, but not necessary)

2. How do I center the image on the page, so the image of the drums are centered?

Thanks
