How to add a stadium picture ?

Hi,
I'm trying to add some stadium pictures to some clubs that don't already have them.

For the moment here is what I have, just a grey pitch :




Here is the code I have added to my config.xml :
(709.png is in the same folder, all of that in /graphics/... )



I've emptied the cache, reloaded the theme.... still nothing.
I can't seem to find what I am doing wrong.
Can anyone help me ?

I found out where the problem was....
I was using the club ID instead of the stadium ID.