This is what the blog is supposed to look like: MacOS-X-ish pinstripe white and grey. It's supposed to look very stylish and professional.
And in Linux, it does. Looks lovely.
In Internet Explorer it looks ragged around the edges where it's supposed to be transparent because the background is a PNG graphic and IE doesn't handle PNG transparency.
In Firefox on Windows it just looks like a plain white sheet. You can't see the grey pinstripes.
I only found out the other day when I installed firefox on my Windows partition, so hey presto, I've got to do something about it.
So, next time I'm in Windows, I'll fire up Paintshop Pro and find a nice wallpaper I can turn into a new background image.