Relative image reference inside KMZ doesn't work using the Google Maps API

[Morten]

Hi All,

I have a KMZ file with a KML file (wms.kml) and a PNG file
(layer_0.png) in the root of the KMZ archive.

The KML file holds a <GroundOverlay> element with a <href> inside an
<Icon> element. If I use an absolute (http) reference in the <href>
element for a given image, this image is displayed as an overlay on
the map using google maps API.
However, if I use a relative reference to the image file inside my KMZ
(the PNG file) nothing is displayed.

The <GroundOverlay> element of KML file looks like this:
<GroundOverlay>
<name>sf:roads</name>
<drawOrder>0</drawOrder>
<Icon>
<href>layer_0.png</href>
<viewRefreshMode>never</viewRefreshMode>
<viewBoundScale>0.75</viewBoundScale>
</Icon>
<LatLonBox>
<north>44.50217406961571</north>
<south>44.372889723061675</south>
<east>-103.62268570673663</east>
<west>-103.87779468339123</west>
</LatLonBox>
</GroundOverlay>

My code is:
var c = new google.maps.LatLng(44.37499724,-103.76320682);
var myOptions = {zoom: 11, center: c, mapTypeId:
google.maps.MapTypeId.ROADMAP }
var map = new google.maps.Map(document.getElementById("map_canvas"),
myOptions);
var ctaLayer = new google.maps.KmlLayer('http://[MYSERVER]/[PATH/TO/
MY/KMZ]');
ctaLayer.setMap(map);

The KMZ file with the relative reference works fine using Google Earth
- but for some reason it doesn't work using the Google Maps API.
Can somebody please tell me why? - And if can change something to make
it possible to display images embedded in a KMZ archive using relative
references?

Thanks,
Morten