Hi Arnd, and list, The tip you suggest did not make it but ... it was very close.
I used a layer defintion with : { map: '/var/data/wms.map', transparent: 'false', layers: 'ortho', format: 'png24', }, Looking at the real query send to the MapServer, I saw that there was a map_imagetype that was still in png ! Changing the layer definition using the following definition solved the problem : { map: '/var/data/wms.map', transparent: 'false', layers: 'ortho', format: 'png24', 'map_imagetype': 'png24'; }, Thanks, Didrik
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