For starters, I do have significant programming experience, but I'm still not finding the answer I need, either by googling, looking at wordpress.com, reading the CSS spec, or asking friends.
The problem is that the PNG image background I have will not autoscale. If you view it in a window all by itself, it autosizes very well: http://www.pflugerblog.com/wp-content/uploads/2010/05/header.png
But, put it in the blog, and no go: http://www.pflugerblog.com/
(Yes, I know my blog looks like dog barf. I'm not done with it, okay?)
What am I doing wrong?