Topic: Background image

I'm a complete newb to this and I'm trying to add a logo to the left of the main image and above the thumbs. I read in another thread the best way to do this is to make the logo the background image. I've put my background image in the folder "images" and put the name of it here backgroundImagePath="logo.jpg" in the gallery.xml file, but I don't see any difference. What am I doing wrong?