You can override the Layer Switcher defaults by inserting the following js
snippet before you initiate your map...
OpenLayers.Lang.en={'overlays':"My Overlays<br>",'baseLayer':"Base
Layers<br>"};
If you want to customize your layer controls further, you'll probably want
to write your own control using getVisibility and setVisibility- see
http://dev.openlayers.org/releases/OpenLayers-2.9.1/doc/apidocs/files/OpenLayers/Layer-js.html#OpenLayers.Layer.getVisibility
http://dev.openlayers.org/releases/OpenLayers-2.9.1/doc/apidocs/files/OpenLayers/Layer-js.html#OpenLayers.Layer.getVisibility
.
You may want to also consider using GeoExt, which supports "Tree Nodes"- see
example here: http://dev.geoext.org/trunk/geoext/examples/tree.html
http://dev.geoext.org/trunk/geoext/examples/tree.html .
-----
Bryan R. McBride, GISP
http://www.bryanmcbride.com bryanmcbride.com
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