Put a background image

[<Gui...@sa...>]

Hello

Excuse me for disturbing you, I have a question I can not solve. I'd
like to put a map on the bottom of this graph style :
http://www.espacemeteo.com/alexy/aaaa.png
Instead of the green background : put a picture card (France)

Thank you very much for your help.
 
Bests regards
 
Guillaume CHANTELOUBE