Ok, I can try to use EXCEPTIONS=INIMAGE parameters, WMS server returns then error message as an image. Does it matter if I use for exampe png, png24 or jpeg image format? The Server I use is MapServer, and it is working very well with PC-clients like OpenLayers and ka-Map.
Should I use BBOX=%.6f,%.6f,%.6f,%.6f or BBOX=%.2f,%.2f,%.2f,%.2f with epsg:3067?