Reading a local KML file in GWT?

I am trying to render KML layers on a google map in GWT. I have set up the geoxml.js file in my host html as : 

<script type="text/javascript" src="geoxml3.js"></script>

public final native JavaScriptObject createKmlParser(JavaScriptObject mapId) /*-{

var myParser = new $wnd.geoXML3.parser({

map : mapId

});

return myParser;

}-*/;

public final native void showKml(JavaScriptObject parser, String kml) /*-{

parser.parseKmlString(kml);

}-*/;

public final native void hideKml(JavaScriptObject parser) /*-{

parser.hideDocument();

}-*/;

public void setupKmlLayer(final MapWidget mapWidget) {

final JavaScriptObject jsoParser = createKmlParser(mapWidget.getJso());

try {

showKml(jsoParser, "cta.kml");

} catch (final JavaScriptException jse) {

Window.alert("javascript exception");

}

}

But I am always getting : javascript exception, the last line above.

Where should I put this cta.kml so that it gets picked up correctly??

Is there a better way to apply layers using local KML files.

Thanks

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