back again with another question :
@ very beginning i ask u a way to manager API key for WordPress MU, u give me a tips using wp-config like :
/* MAPPRESS API KEY */
It work like a charm, then my new question is, can we do the same with MAPBOX ?
IN same time, i play a little with ur suggestion and it work like a charm, i make a standard and neutral skin for map, it looks much better :