Hopefully an easy one for somebody...

The template I use for all of my pages looks at the style.css to get the header image. I want to change it so that it looks at who logs in and displays an image based on who they are.

This could be either multiple css or a line in the stylesheet. Either:

[username code to grab who logs in]/style.css

or

[username code within the stylesheet to point to a folder with their reqd image]

Any ideas folks?