Alternate JPG for IE6 for PNG site title image?

[TWood]

I'm using a PNG with alpha that puts white letters over the default dark blue header. In IE6, that doesn't work, I know. Is there a simple way to swap in a JPG for IE6? I know I can just make a JPG the default by using an image with the matching blue background, but I *shouldn't* have to.

I was showing the site to the Chase Bank guy when opening a business account for PayPal receipts, and they are on....IE6. As is the state agency I work for.....Die IE6, die!