[John]

We have tried this with both GIF and PNG and still no dice. We have done transparent images 1000 times before with no problem. These are notes from our designer that might help you.

Just had a quick look, it’s going to take a bit of work, need to change the site structure a little bit as the background colour is actually from the whole wrapper and not the header div itself. If you make the wrapper transparent, the header BG disappears but so too does the rest of the site white background.