Change Header image for Pupil Pages

[SimpleSi]

I had an idea but don't know where to start

 

I think it would look cool to have a nice jazzy type header when people are viewing the pupil work pages on my websites but keeping the "corporate" image when people are viewing the rest of site.

 

Any ideas on how to implement a different header image (or even a whole template change) but only when one particular main menu item is selected ?

 

 

regards

 

Simon