Received through other message board the option to use Google.kml files.
First test looks OK so problem seems solved.

?xml version="1.0" encoding="UTF-8"?
kml xmlns="http://earth.google.com/kml/2.0";
GroundOverlay
namekaart1/name
color5bffffff/color
Icon
hrefkaart1.gif/href
viewBoundScale0.75/viewBoundScale
/Icon
LatLonBox id="khLatLonBox781"
north53.59750200000001/north
south53.453258/south
east7.164318000000001/east
west6.833967/west
/LatLonBox
/GroundOverlay
/kml

Save as kaart1.kml, and start in Google Earth.
repeat part between GroundOverlay and /GroundOverlay for every other
map.


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